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Section 1
Conversion Factors and Mathematical Symbols*
James O. Maloney, Ph.D., P.E. Emeritus Professor of Chemical Engineering, University of Kansas; Fellow, American Institute of Chemical Engineering; Fellow, American Association for the Advancement of Science; Member, American Chemical Society; Member, American Society for Engineering Education
Table 1-1 Table 1-2a Table 1-2b Table 1-3 Table 1-4 Table 1-5 Table 1-6 Table 1-7 Table 1-8
CONVERSION FACTORS SI Base and Supplementary Quantities and Units. . . . . . . Derived Units of SI that Have Special Names. . . . . . . . . . Additional Common Derived Units of SI . . . . . . . . . . . . . SI Prefixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conversion Factors: U.S. Customary and Commonly Used Units to SI Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . Metric Conversion Factors as Exact Numerical Multiples of SI Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alphabetical Listing of Common Conversions . . . . . . . . . Common Units and Conversion Factors . . . . . . . . . . . . . . Kinematic-Viscosity Conversion Formulas . . . . . . . . . . . .
1-2 1-2 1-2 1-2 1-3 1-12 1-14 1-17 1-17
Table 1-9 Values of the Gas-Law Constant. . . . . . . . . . . . . . . . . . . . . Table 1-10 United States Customary System of Weights and Measures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 1-11 Temperature Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . Table 1-12 Greek Alphabet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 1-13 Specific Gravity, Degrees Baumé, Degrees API, Degrees Twaddell, Pounds per Gallon, Pounds per Cubic Foot . . . Table 1-14 Fundamental Physical Constants . . . . . . . . . . . . . . . . . . . .
1-17 1-18 1-18 1-18 1-19 1-20
CONVERSION OF VALUES FROM U.S. CUSTOMARY UNITS TO SI UNITS
*Much of the material was taken from Sec. 1. of the fifth edition. The contribution of Cecil H. Chilton in developing that material is acknowledged. 1-1
Copyright © 2008, 1997, 1984, 1973, 1963, 1950, 1941, 1934 by The McGraw-Hill Companies, Inc. Click here for terms of use.
TABLE 1-1
SI Base and Supplementary Quantities and Units
Quantity or “dimension” Base quantity or “dimension” length mass time electric current thermodynamic temperature amount of substance luminous intensity Supplementary quantity or “dimension” plane angle solid angle
SI unit
SI unit symbol (“abbreviation”); Use roman (upright) type
meter kilogram second ampere kelvin mole* candela
m kg s A K mol cd
radian steradian
rad sr
*When the mole is used, the elementary entities must be specified; they may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.
TABLE 1-2a
Derived Units of SI that Have Special Names Quantity
Unit
Symbol
Formula
frequency (of a periodic phenomenon) force pressure, stress energy, work, quantity of heat power, radiant flux quantity of electricity, electric charge electric potential, potential difference, electromotive force capacitance electric resistance conductance magnetic flux magnetic-flux density inductance luminous flux illuminance activity (of radionuclides) absorbed dose
hertz newton pascal joule watt coulomb volt
Hz N Pa J W C V
l/s (kg⋅m)/s2 N/m2 N⋅m J/s A⋅s W/A
farad ohm siemens weber tesla henry lumen lux becquerel gray
F Ω S Wb T H lm lx Bq Gy
C/V V/A A/V V⋅s Wb/m2 Wb/A cd⋅sr lm/m2 l/s J/kg
TABLE 1-2b
Additional Common Derived Units of SI
Quantity
Unit
acceleration angular acceleration angular velocity area concentration (of amount of substance) current density density, mass electric-charge density electric-field strength electric-flux density energy density entropy heat capacity heat-flux density, irradiance luminance magnetic-field strength molar energy molar entropy molar-heat capacity moment of force permeability permittivity radiance
meter per second squared radian per second squared radian per second square meter mole per cubic meter
m/s2 rad/s2 rad/s m2 mol/m3
ampere per square meter kilogram per cubic meter coulomb per cubic meter volt per meter coulomb per square meter joule per cubic meter joule per kelvin joule per kelvin watt per square meter
A/m2 kg/m3 C/m3 V/m C/m2 J/m3 J/K J/K W/m2
candela per square meter ampere per meter joule per mole joule per mole-kelvin joule per mole-kelvin newton-meter henry per meter farad per meter watt per square-metersteradian watt per steradian joule per kilogram-kelvin joule per kilogram joule per kilogram-kelvin cubic meter per kilogram newton per meter watt per meter-kelvin meter per second pascal-second square meter per second cubic meter 1 per meter
cd/m2 A/m J/mol J/(mol⋅K) J/(mol⋅K) N⋅m H/m F/m W/(m2⋅sr)
radiant intensity specific-heat capacity specific energy specific entropy specific volume surface tension thermal conductivity velocity viscosity, dynamic viscosity, kinematic volume wave number
TABLE 1-3
W/sr J/(kg⋅K) J/kg J/(kg⋅K) m3/kg N/m W/(m⋅K) m/s Pa⋅s m2/s m3 1/m
SI Prefixes
Multiplication factor
Prefix
Symbol
000 = 1018 000 = 1015 000 = 1012 000 = 109 000 = 106 000 = 103 100 = 102 10 = 101 0.1 = 10−1 0.01 = 10−2 0.001 = 10−3 0.000 001 = 10−6 0.000 000 001 = 10−9 0.000 000 000 001 = 10−12 0.000 000 000 000 001 = 10−15 0.000 000 000 000 000 001 = 10−18
exa peta tera giga mega kilo hecto* deka* deci* centi milli micro nano pico femto atto
E P T G M k h da d c m µ n p f a
1 000 000 000 1 000 000 1 000 1
000 000 000 000 1
000 000 000 000 000 1
*Generally to be avoided.
1-2
Symbol
TABLE 1-4
Conversion Factors: U.S. Customary and Commonly Used Units to SI Units Customary or commonly used unit
Quantity
SI unit
Alternate SI unit
Conversion factor; multiply customary unit by factor to obtain SI unit
Space,† time Length
naut mi mi chain link fathom yd ft
1.852* E + 00 1.609 344* E + 00 2.011 68* E + 01 2.011 68* E − 01 1.828 8* E + 00 9.144* E − 01 3.048* E − 01 3.048* E + 01 2.54* E + 01 2.54 E + 00 2.54* E + 01
in in mil
km km m m m m m cm mm cm µm
Length/length
ft/mi
m/km
1.893 939 E − 01
Length/volume
ft/U.S. gal ft/ft3 ft/bbl
m/m3 m/m3 m/m3
8.051 964 E + 01 1.076 391 E + 01 1.917 134 E + 00
Area
mi2 section acre ha yd2 ft2 in2
km2 ha ha m2 m2 m2 mm2 cm2
2.589 988 E + 00 2.589 988 E + 02 4.046 856 E − 01 1.000 000* E + 04 8.361 274 E − 01 9.290 304* E − 02 6.451 6* E + 02 6.451 6* E + 00
Area/volume
ft2/in3 ft2/ft3
m2/cm3 m2/m3
5.699 291 E − 03 3.280 840 E + 00
Volume
cubem acre⋅ft
km3 m3 ha⋅m m3 m3 m3 dm3 m3 dm3 m3 dm3 dm3 dm3 dm3 cm3 cm3 cm3
4.168 182 1.233 482 1.233 482 7.645 549 1.589 873 2.831 685 2.831 685 4.546 092 4.546 092 3.785 412 3.785 412 1.136 523 9.463 529 4.731 765 2.841 307 2.957 353 1.638 706
yd3 bbl (42 U.S. gal) ft3 U.K. gal U.S. gal U.K. qt U.S. qt U.S. pt U.K. fl oz U.S. fl oz in3
L L L L L L
E + 00 E + 03 E − 01 E − 01 E − 01 E − 02 E + 01 E − 03 E + 00 E − 03 E + 00 E + 00 E − 01 E − 01 E + 01 E + 01 E + 01
Volume/length (linear displacement)
bbl/in bbl/ft ft3/ft U.S. gal/ft
m3m m3/m m3/m m3/m L/m
6.259 342 E + 00 5.216 119 E − 01 9.290 304* E − 02 1.241 933 E − 02 1.241 933 E + 01
Plane angle
rad deg (°) min (′) sec (″)
rad rad rad rad
1 1.745 329 E − 02 2.908 882 E − 04 4.848 137 E − 06
Solid angle
sr
sr
1
Time
year week h
a d s min s h ns
1 7.0* 3.6* 6.0* 6.0* 1.666 667 1
E + 00 E + 03 E + 01 E + 01 E − 02
1.016 047 9.071 847 5.080 234 4.535 924 4.535 924 3.110 348 2.834 952 6.479 891
E + 00 E − 01 E + 01 E + 01 E − 01 E + 01 E + 01 E + 01
min mµs Mass, amount of substance Mass
U.K. ton U.S. ton U.K. cwt U.S. cwt lbm oz (troy) oz (av) gr
Mg Mg kg kg kg g g mg
t t
1-3
TABLE 1-4
Conversion Factors: U.S. Customary and Commonly Used Units to SI Units (Continued) Customary or commonly used unit
Quantity Amount of substance
lbm⋅mol std m3(0°C, 1 atm) std ft3 (60°F, 1 atm)
SI unit
Alternate SI unit
Conversion factor; multiply customary unit by factor to obtain SI unit 4.535 924 E − 01 4.461 58 E − 02 1.195 30 E − 03
kmol kmol kmol
Enthalpy, calorific value, heat, entropy, heat capacity Calorific value, enthalpy (mass basis)
Btu/lbm cal/g cal/lbm
MJ/kg kJ/kg kWh/kg kJ/kg J/kg
Caloric value, enthalpy (mole basis)
kcal/(g⋅mol) Btu/(lb⋅mol)
kJ/kmol kJ/kmol
Calorific value (volume basis—solids and liquids)
Btu/U.S. gal
MJ/m3 kJ/m3 kWh/m3 MJ/m3 kJ/m3 kWh/m3 MJ/m3 kJ/m3 kWh/m3 MJ/m3 kJ/m3
kJ/dm3
Btu/U.K. gal Btu/ft3
cal/mL (ft⋅lbf)/U.S. gal
J/g J/g
2.326 000 2.326 000 6.461 112 4.184* 9.224 141
E − 03 E + 00 E − 04 E + 00 E + 00
4.184* E + 03 2.326 000 E + 00
kJ/dm3 kJ/dm3
2.787 163 2.787 163 7.742 119 2.320 800 2.320 800 6.446 667 3.725 895 3.725 895 1.034 971 4.184* 3.581 692
E − 01 E + 02 E − 02 E − 01 E + 02 E − 02 E − 02 E + 01 E − 02 E + 00 E − 01
Calorific value (volume basis—gases)
cal/mL kcal/m3 Btu/ft3
kJ/m3 kJ/m3 kJ/m3 kWh/m3
J/dm3 J/dm3 J/dm3
4.184* 4.184* 3.725 895 1.034 971
E + 03 E + 00 E + 01 E − 02
Specific entropy
Btu/(lbm⋅°R) cal/(g⋅K) kcal/(kg⋅°C)
kJ/(kg⋅K) kJ/(kg⋅K) kJ/(kg⋅K)
J/(g⋅K) J/(g⋅K) J/(g⋅K)
4.186 8* 4.184* 4.184*
E + 00 E + 00 E + 00
Specific-heat capacity (mass basis)
kWh/(kg⋅°C) Btu/(lbm⋅°F) kcal/(kg⋅°C)
kJ/(kg⋅K) kJ/(kg⋅K) kJ/(kg⋅K)
J/(g⋅K) J/(g⋅K) J/(g⋅K)
3.6* 4.186 8* 4.184*
E + 03 E + 00 E + 00
Specific-heat capacity (mole basis)
Btu/(lb⋅mol⋅°F) cal/(g⋅mol⋅°C)
kJ/(kmol⋅K) kJ/(kmol⋅K)
4.186 8* 4.184*
E + 00 E + 00
Temperature (absolute)
°R K
K K
5/9 1
Temperature (traditional)
°F
°C
5/9(°F − 32)
Temperature (difference)
°F
K, °C
5/9
Pressure
atm (760 mmHg at 0°C or 14,696 psi)
µmHg (0°C) µ bar mmHg = torr (0°C) cmH2O (4°C) lbf/ft2 (psf) mHg (0°C) bar dyn/cm2
MPa kPa bar MPa kPa MPa kPa bar kPa kPa kPa kPa kPa Pa Pa Pa
1.013 250* E − 01 1.013 250* E + 02 1.013 250* E + 00 1.0* E − 01 1.0* E + 02 6.894 757 E − 03 6.894 757 E + 00 6.894 757 E − 02 3.376 85 E + 00 2.488 4 E − 01 1.333 224 E − 01 9.806 38 E − 02 4.788 026 E − 02 1.333 224 E − 01 1.0* E + 05 1.0* E − 01
Vacuum, draft
inHg (60°F) inH2O (39.2°F) inH2O (60°F) mmHg (0°C) = torr cmH2O (4°C)
kPa kPa kPa kPa kPa
3.376 85 2.490 82 2.488 4 1.333 224 9.806 38
E + 00 E − 01 E − 01 E − 01 E − 02
Liquid head
ft in
m mm cm
3.048* 2.54* 2.54*
E − 01 E + 01 E + 00
Pressure drop/length
psi/ft
kPa/m
2.262 059 E + 01
Temperature, pressure, vacuum
bar mmHg (0°C) = torr
1-4
TABLE 1-4
Conversion Factors: U.S. Customary and Commonly Used Units to SI Units (Continued) Customary or commonly used unit
Quantity
SI unit
Alternate SI unit
Conversion factor; multiply customary unit by factor to obtain SI unit
Density, specific volume, concentration, dosage kg/m3 g/m3 kg/m3 g/cm3 kg/m3 kg/m3 g/cm3 kg/m3 kg/m3
1.601 846 1.601 846 1.198 264 1.198 264 9.977 633 1.601 846 1.601 846 1.0* 1.601 846
E + 01 E + 04 E + 02 E − 01 E + 01 E + 01 E − 02 E + 03 E + 01
ft /lbm U.K. gal/lbm U.S. gal/lbm
m3/kg m3/g dm3/kg dm3/kg dm3/kg
6.242 796 6.242 796 6.242 796 1.002 242 8.345 404
E − 02 E − 05 E + 01 E + 01 E + 00
Specific volume (mole basis)
L/(g⋅mol) ft3/(lb⋅mol)
m3/kmol m3/kmol
1 6.242 796 E − 02
Specific volume
bbl/U.S. ton bbl/U.K. ton
m3/t m3/t
1.752 535 E − 01 1.564 763 E − 01
Yield
bbl/U.S. ton bbl/U.K. ton U.S. gal/U.S. ton U.S. gal/U.K. ton
dm3/t dm3/t dm3/t dm3/t
Concentration (mass/mass)
wt % wt ppm
kg/kg g/kg mg/kg
lbm/bbl g/U.S. gal g/U.K. gal lbm/1000 U.S. gal lbm/1000 U.K. gal gr/U.S. gal gr/ft3 lbm/1000 bbl mg/U.S. gal gr/100 ft3
kg/m3 kg/m3 kg/m3 g/m3 g/m3 g/m3 mg/m3 g/m3 g/m3 mg/m3
ft3/ft3 bbl/(acre⋅ft) vol% U.K. gal/ft3 U.S. gal/ft3 mL/U.S. gal mL/U.K. gal vol ppm U.K. gal/1000 bbl U.S. gal/1000 bbl U.K. pt/1000 bbl
m3/m3 m3/m3 m3/m3 dm3/m3 dm3/m3 dm3/m3 dm3/m3 cm3/m3 dm3/m3 cm3/m3 cm3/m3 cm3/m3
Concentration (mole/volume)
(lb⋅mol)/U.S. gal (lb⋅mol)/U.K. gal (lb⋅mol)/ft3 std ft3 (60°F, 1 atm)/bbl
kmol/m3 kmol/m3 kmol/m3 kmol/m3
Concentration (volume/mole)
U.S. gal/1000 std ft3 (60°F/60°F) bbl/million std ft3 (60°F/60°F)
dm3/kmol dm3/kmol
Throughput (mass basis)
U.K. ton/year U.S. ton/year U.K. ton/day
Density
lbm/ft3 lbm/U.S. gal lbm/U.K. gal lbm/ft3 g/cm3 lbm/ft3
Specific volume
ft3/lbm 3
Concentration (mass/volume)
Concentration (volume/volume)
cm3/g cm3/g
L/t L/t L/t L/t
g/dm3 g/L mg/dm3 mg/dm3 mg/dm3 mg/dm3 mg/dm3
L/m3 L/m3 L/m3 L/m3 L/m3
L/kmol L/kmol
1.752 535 1.564 763 4.172 702 3.725 627
E + 02 E + 02 E + 00 E + 00
1.0* 1.0* 1
E − 02 E + 01
2.853 010 2.641 720 2.199 692 1.198 264 9.977 633 1.711 806 2.288 351 2.853 010 2.641 720 2.288 351
E + 00 E − 01 E − 01 E + 02 E + 01 E + 01 E + 03 E + 00 E − 01 E + 01
1 1.288 931 1.0* 1.605 437 1.336 806 2.641 720 2.199 692 1 1.0* 2.859 403 2.380 952 3.574 253
E − 04 E − 02 E + 02 E + 02 E − 01 E − 01 E − 03 E + 01 E + 01 E + 00
1.198 264 9.977 644 1.601 846 7.518 21
E + 02 E + 01 E + 01 E − 03
3.166 91 1.330 10
E + 00 E − 01
1.016 047 9.071 847 1.016 047 4.233 529 9.071 847 3.779 936 1.016 047 9.071 847 4.535 924
E + 00 E − 01 E + 00 E − 02 E − 01 E − 02 E + 00 E − 01 E − 01
Facility throughput, capacity
U.S. ton/day U.K. ton/h U.S. ton/h lbm/h
t/a t/a t/d t/h t/d t/h t/h t/h kg/h
1-5
TABLE 1-4
Conversion Factors: U.S. Customary and Commonly Used Units to SI Units (Continued) Customary or commonly used unit
Quantity Throughput (volume basis)
bbl/day 3
ft /day bbl/h ft3/h U.K. gal/h U.S. gal/h U.K. gal/min U.S. gal/min
SI unit
Alternate SI unit
Conversion factor; multiply customary unit by factor to obtain SI unit E + 01 E − 01 E − 03 E − 01 E − 02 E − 03 E − 03 E − 03 E − 03 E − 01 E − 02 E − 01 E − 02
t/a m3/d m3/h m3/h m3/h m3/h L/s m3/h L/s m3/h L/s m3/h L/s
5.803 036 1.589 873 1.179 869 1.589 873 2.831 685 4.546 092 1.262 803 3.785 412 1.051 503 2.727 655 7.576 819 2.271 247 6.309 020
kmol/h kmol/s
4.535 924 E − 01 1.259 979 E − 04
Throughput (mole basis)
(lbm⋅mol)/h
Flow rate (mass basis)
U.K. ton/min U.S. ton/min U.K. ton/h U.S. ton/h U.K. ton/day U.S. ton/day million lbm/year U.K. ton/year U.S. ton/year lbm/s lbm/min lbm/h
kg/s kg/s kg/s kg/s kg/s kg/s kg/s kg/s kg/s kg/s kg/s kg/s
1.693 412 1.511 974 2.822 353 2.519 958 1.175 980 1.049 982 5.249 912 3.221 864 2.876 664 4.535 924 7.559 873 1.259 979
E + 01 E + 01 E − 01 E − 01 E − 02 E − 02 E + 00 E − 05 E − 05 E − 01 E − 03 E − 04
Flow rate (volume basis)
bbl/day
U.K. gal/h U.S. gal/h U.K. gal/min U.S. gal/min ft3/min ft3/s
m3/d L/s m3/d L/s m3/s L/s m3/s L/s dm3/s dm3/s dm3/s dm3/s dm3/s dm3/s
1.589 873 1.840 131 2.831 685 3.277 413 4.416 314 4.416 314 7.865 791 7.865 791 1.262 803 1.051 503 7.576 820 6.309 020 4.719 474 2.831 685
E − 01 E − 03 E − 02 E − 04 E − 05 E − 02 E − 06 E − 03 E − 03 E − 03 E − 02 E − 02 E − 01 E + 01
Flow rate (mole basis)
(lb⋅mol)/s (lb⋅mol)/h million scf/D
kmol/s kmol/s kmol/s
4.535 924 E − 01 1.259 979 E − 04 1.383 45 E − 02
Flow rate/length (mass basis)
lbm/(s⋅ft) lbm/(h⋅ft)
kg/(s⋅m) kg/(s⋅m)
1.488 164 E + 00 4.133 789 E − 04
Flow rate/length (volume basis)
U.K. gal/(min⋅ft) U.S. gal/(min⋅ft) U.K. gal/(h⋅in) U.S. gal/(h⋅in) U.K. gal/(h⋅ft) U.S. gal/(h⋅ft)
m2/s m2/s m2/s m2/s m2/s m2/s
Flow rate/area (mass basis)
lbm/(s⋅ft2) lbm/(h⋅ft2)
kg/(s⋅m2) kg/(s⋅m2)
Flow rate/area (volume basis)
ft3/(s⋅ft2) ft3/(min⋅ft2) U.K. gal/(h⋅in2) U.S. gal/(h⋅in2) U.K. gal/(min⋅ft2) U.S. gal/(min⋅ft2) U.K. gal/(h⋅ft2) U.S. gal/(h⋅ft2)
m/s m/s m/s m/s m/s m/s m/s m/s
Flow rate
3
ft /day bbl/h ft3/h
1-6
L/s L/s L/s L/s L/s L/s
m3/(s⋅m) m3/(s⋅m) m3/(s⋅m) m3/(s⋅m) m3/(s⋅m) m3/(s⋅m)
2.485 833 2.069 888 4.971 667 4.139 776 4.143 055 3.449 814
E − 04 E − 04 E − 05 E − 05 E − 06 E − 06
4.882 428 E + 00 1.356 230 E − 03 m3/(s⋅m2) m3/(s⋅m2) m3/(s⋅m2) m3/(s⋅m2) m3/(s⋅m2) m3/(s⋅m2) m3/(s⋅m2) m3/(s⋅m2)
3.048* 5.08* 1.957 349 1.629 833 8.155 621 6.790 972 1.359 270 1.131 829
E − 01 E − 03 E − 03 E − 03 E − 04 E − 04 E − 05 E − 05
TABLE 1-4
Conversion Factors: U.S. Customary and Commonly Used Units to SI Units (Continued) Customary or commonly used unit
Quantity
SI unit
Alternate SI unit
Conversion factor; multiply customary unit by factor to obtain SI unit
Energy, work, power Energy, work
therm
E + 02 E + 05 E + 01 E + 01 E + 00 E + 03 E − 01 E + 00 E + 03 E − 01 E + 00 E + 03 E + 00 E − 04 E + 00 E − 04 E + 00 E − 03 E − 03 E − 03 E − 03 E − 05 E − 07
kcal cal ft⋅lbf lbf⋅ft J (lbf⋅ft2)/s2 erg
MJ kJ kWh MJ MJ kJ kWh MJ kJ kWh MJ kJ kJ kWh kJ kWh kJ kJ kJ kJ kJ kJ J
1.055 056 1.055 056 2.930 711 1.431 744 2.684 520 2.684 520 7.456 999 2.647 780 2.647 780 7.354 999 3.6* 3.6* 1.899 101 5.275 280 1.055 056 2.930 711 4.184* 4.184* 1.355 818 1.355 818 1.0* 4.214 011 1.0*
Impact energy
kgf⋅m lbf⋅ft
J J
9.806 650* E + 00 1.355 818 E + 00
Surface energy
erg/cm2
mJ/m2
1.0*
Specific-impact energy
(kgf⋅m)/cm2 (lbf⋅ft)/in2
J/cm2 J/cm2
9.806 650* E − 02 2.101 522 E − 03
Power
million Btu/h ton of refrigeration Btu/s kW hydraulic horsepower—hhp hp (electric) hp [(550 ft⋅lbf)/s] ch or CV Btu/min (ft⋅lbf)/s kcal/h Btu/h (ft⋅lbf)/min
MW kW kW kW kW kW kW kW kW kW W W W
2.930 711 3.516 853 1.055 056 1 7.460 43 7.46* 7.456 999 7.354 999 1.758 427 1.355 818 1.162 222 2.930 711 2.259 697
Power/area
Btu/(s⋅ft2) cal/(h⋅cm2) Btu/(h⋅ft2)
kW/m2 kW/m2 kW/m2
1.135 653 E + 01 1.162 222 E − 02 3.154 591 E − 03
Heat-release rate, mixing power
hp/ft3 cal/(h⋅cm3) Btu/(s⋅ft3) Btu/(h⋅ft3)
kW/m3 kW/m3 kW/m3 kW/m3
2.633 414 1.162 222 3.725 895 1.034 971
Cooling duty (machinery)
Btu/(bhp⋅h)
W/kW
Specific fuel consumption (mass basis)
lbm/(hp⋅h)
mg/J kg/kWh
kg/MJ
1.689 659 E − 01 6.082 774 E − 01
Specific fuel consumption (volume basis)
m3/kWh U.S. gal/(hp⋅h) U.K. pt/(hp⋅h)
dm3/MJ dm3/MJ dm3/MJ
mm3/J mm3/J mm3/J
2.777 778 E + 02 1.410 089 E + 00 2.116 806 E − 01
Fuel consumption
U.K. gal/mi U.S. gal/mi mi/U.S. gal mi/U.K. gal
dm3/100 km dm3/100 km km/dm3 km/dm3
L/100 km L/100 km km/L km/L
2.824 807 2.352 146 4.251 437 3.540 064
U.S. tonf⋅mi hp⋅h ch⋅h or CV⋅h kWh Chu Btu
E + 00
E − 01 E + 00 E + 00 E − 01 E − 01 E − 01 E − 01 E − 02 E − 03 E + 00 E − 01 E − 02
E + 01 E + 00 E + 01 E − 02
3.930 148 E − 01
E + 02 E + 02 E − 01 E − 01
1-7
TABLE 1-4
Conversion Factors: U.S. Customary and Commonly Used Units to SI Units (Continued) Customary or commonly used unit
Quantity
SI unit
Alternate SI unit
Conversion factor; multiply customary unit by factor to obtain SI unit
in/s in/min
km/h km/h m/s cm/s m/s mm/s mm/s m/d mm/s mm/s
1.852* E + 00 1.609 344* E + 00 3.048* E − 01 3.048* E + 01 5.08* E − 03 8.466 667 E − 02 3.527 778 E − 03 3.048* E − 01 2.54* E + 01 4.233 333 E − 01
Corrosion rate
in/year (ipy) mil/year
mm/a mm/a
2.54* 2.54*
Rotational frequency
r/min
r/s rad/s
1.666 667 E − 02 1.047 198 E − 01
Acceleration (linear)
ft/s2
m/s2 cm/s2
3.048* 3.048*
Acceleration (rotational)
rpm/s
rad/s2
1.047 198 E − 01
Momentum
(lbm⋅ft)/s
(kg⋅m)/s
1.382 550 E − 01
Force
U.K. tonf U.S. tonf kgf (kp) lbf dyn
kN kN N N mN
9.964 016 E + 00 8.896 443 E + 00 9.806 650* E + 00 4.448 222 E + 00 1.0 E − 02
Bending moment, torque
U.S. tonf⋅ft kgf⋅m lbf⋅ft lbf⋅in
kN⋅m N⋅m N⋅m N⋅m
2.711 636 E + 00 9.806 650* E + 00 1.355 818 E + 00 1.129 848 E − 01
Bending moment/length
(lbf⋅ft)/in (lbf⋅in)/in
(N⋅m)/m (N⋅m)/m
5.337 866 E + 01 4.448 222 E + 00
Moment of inertia
lbm⋅ft2
Velocity (linear), speed
knot mi/h ft/s ft/min ft/h ft/day
MPa MPa MPa MPa kPa Pa
E − 01 E + 01
4.214 011 E − 02
kg⋅m2 2
E + 01 E − 02
N/mm2 N/mm2 N/mm2 N/mm2
1.378 951 E + 01 9.806 650* E + 00 9.576 052 E − 02 6.894 757 E − 03 4.788 026 E − 02 1.0* E − 01
Stress
U.S. tonf/in kgf/mm2 U.S. tonf/ft2 lbf/in2 (psi) lbf/ft2 (psf) dyn/cm2
Mass/length
lbm/ft
kg/m
1.488 164 E + 00
Mass/area structural loading, bearing capacity (mass basis)
U.S. ton/ft2 lbm/ft2
Mg/m2 kg/m2
9.764 855 E + 00 4.882 428 E + 00
Diffusivity
ft2/s m2/s ft2/h
m2/s mm2/s m2/s
9.290 304* E − 02 1.0* E + 06 2.580 64* E − 05
Thermal resistance
(°C⋅m2⋅h)/kcal (°F⋅ft2⋅h)/Btu
(K⋅m2)/kW (K⋅m2)/kW
8.604 208 E + 02 1.761 102 E + 02
Heat flux
Btu/(h⋅ft2)
kW/m2
3.154 591 E − 03
Thermal conductivity
(cal⋅cm)/(s⋅cm2⋅°C) (Btu⋅ft)/(h⋅ft2⋅°F)
W/(m⋅K) W/(m⋅K) (kJ⋅m)/(h⋅m2⋅K) W/(m⋅K) W/(m⋅K) W/(m⋅K)
4.184* 1.730 735 6.230 646 1.162 222 1.442 279 1.162 222
E + 02 E + 00 E + 00 E + 00 E − 01 E − 01
kW/(m2⋅K) kW/(m2⋅K) kW/(m2⋅K) kW/(m2⋅K) kJ/(h⋅m2⋅K) kW/(m2⋅K) kW/(m2⋅K)
4.184* 2.044 175 1.162 222 5.678 263 2.044 175 5.678 263 1.162 222
E + 01 E + 01 E − 02 E − 03 E + 01 E − 03 E − 03
Miscellaneous transport properties
(kcal⋅m)/(h⋅m2⋅°C) (Btu⋅in)/(h⋅ft2⋅°F) (cal⋅cm)/(h⋅cm2⋅°C) Heat-transfer coefficient
cal/(s⋅cm2⋅°C) Btu/(s⋅ft2⋅°F) cal/(h⋅cm2⋅°C) Btu/(h⋅ft2⋅°F) Btu/(h⋅ft2⋅°R) kcal/(h⋅m2⋅°C)
1-8
TABLE 1-4
Conversion Factors: U.S. Customary and Commonly Used Units to SI Units (Continued) Customary or commonly used unit
Quantity
SI unit
Alternate SI unit
kW/(m3⋅K) kW/(m3⋅K)
Conversion factor; multiply customary unit by factor to obtain SI unit
Volumetric heat-transfer coefficient
Btu/(s⋅ft3⋅°F) Btu/(h⋅ft3⋅°F)
6.706 611 E + 01 1.862 947 E − 02
Surface tension
dyn/cm
mN/m
Viscosity (dynamic)
(lbf⋅s)/in2 (lbf⋅s)/ft2 (kgf⋅s)/m2 lbm/(ft⋅s) (dyn⋅s)/cm2 cP lbm/(ft⋅h)
Pa⋅s Pa⋅s Pa⋅s Pa⋅s Pa⋅s Pa⋅s Pa⋅s
Viscosity (kinematic)
ft2/s in2/s m2/h ft2/h cSt
m2/s mm2/s mm2/s m2/s mm2/s
9.290 304* E − 02 6.451 6* E + 02 2.777 778 E + 02 2.580 64* E − 05 1
Permeability
darcy millidarcy
µm2 µm2
9.869 233 E − 01 9.869 233 E − 04
Thermal flux
Btu/(h⋅ft2) Btu/(s⋅ft2) cal/(s⋅cm2)
W/m2 W/m2 W/m2
3.152 1.135 4.184
E + 00 E + 04 E + 04
Mass-transfer coefficient
(lb⋅mol)/[h⋅ft2(lb⋅mol/ft3)] (g⋅mol)/[s⋅m2(g⋅mol/L)]
m/s m/s
8.467 1.0
E − 05 E + 01
Admittance
S
S
1
Capacitance
µF
µF
1
Charge density
C/mm3
C/mm3
1
Conductance
S
S S
1 1
S/m /m m /m
S/m S/m mS/m
1 1 1
Current density
A/mm2
A/mm2
1
Displacement
C/cm2
C/cm2
1
Electric charge
C
C
1
Electric current
A
A
1
Electric-dipole moment
C⋅m
C⋅m
1
1 (N⋅s)/m2 (N⋅s)/m2 (N⋅s)/m2 (N⋅s)/m2 (N⋅s)/m2 (N⋅s)/m2 (N⋅s)/m2
6.894 757 E + 03 4.788 026 E + 01 9.806 650* E + 00 1.488 164 E + 00 1.0* E − 01 1.0* E − 03 4.133 789 E − 04
Electricity, magnetism
Conductivity
(mho)
Electric-field strength
V/m
V/m
1
Electric flux
C
C
1
Electric polarization
C/cm2
C/cm2
1
Electric potential
V mV
V mV
1 1
Electromagnetic moment
A⋅m2
A⋅m2
1
Electromotive force
V
V
1
Flux of displacement
C
C
1
Frequency
cycles/s
Hz
1
Impedance
Ω
Ω
1
Linear-current density
A/mm
A/mm
1
Magnetic-dipole moment
Wb⋅m
Wb⋅m
1
Magnetic-field strength
A/mm Oe gamma
A/mm A/m A/m
1 7.957 747 E + 01 7.957 747 E − 04
Magnetic flux
mWb
mWb
1
1-9
TABLE 1-4
Conversion Factors: U.S. Customary and Commonly Used Units to SI Units (Continued) Customary or commonly used unit
Quantity Magnetic-flux density
mT G gamma
SI unit mT T nT
Alternate SI unit
Conversion factor; multiply customary unit by factor to obtain SI unit 1 1.0* 1
Magnetic induction
mT
mT
1
Magnetic moment
A⋅m2
A⋅m2
1
Magnetic polarization
mT
mT
1
Magnetic potential difference
A
A
1
Magnetic-vector potential
Wb/mm
Wb/mm
1
Magnetization
A/mm
A/mm
1
Modulus of admittance
S
S
1
Modulus of impedance
Ω
Ω
1
Mutual inductance
H
H
1
Permeability
µH/m
µH/m
1
E − 04
Permeance
H
H
1
Permittivity
µF/m
µF/m
1
Potential difference
V
V
1
Quantity of electricity
C
C
1
Reactance
Ω
Ω
1
Reluctance
H−1
H−1
1
Resistance
Ω
Ω
1
Resistivity
Ω⋅cm Ω⋅m
Ω⋅cm Ω⋅m
1 1
Self-inductance
mH
mH
1
Surface density of change
mC/m2
mC/m2
1
Susceptance
S
S
1
Volume density of charge
C/mm3
C/mm3
1
Absorbed dose
rad
Gy
1.0*
Acoustical energy
J
J
1
Acoustical intensity
W/cm2
W/m2
1.0*
Acoustical power
W
W
1
Sound pressure
N/m2
N/m2
1.0*
Illuminance
fc
lx
1.076 391 E + 01
Illumination
fc
lx
1.076 391 E + 01
Irradiance
W/m2
W/m2
1
Light exposure
fc⋅s
lx⋅s
1.076 391 E + 01
Luminance
cd/m2
cd/m2
1
Acoustics, light, radiation
Luminous efficacy
lm/W
lm/W
1
Luminous exitance
lm/m2
lm/m2
1
Luminous flux
lm
lm
1
Luminous intensity
cd
cd
1
Radiance
W/m2⋅sr
W/m2⋅sr
1
Radiant energy
J
J
1
Radiant flux
W
W
1
Radiant intensity
W/sr
W/sr
1
Radiant power
W
W
1
1-10
E − 02 E + 04
TABLE 1-4
Conversion Factors: U.S. Customary and Commonly Used Units to SI Units (Concluded) Customary or commonly used unit
Quantity
SI unit
Alternate SI unit
Conversion factor; multiply customary unit by factor to obtain SI unit
Wavelength
Å
nm
1.0*
E − 01
Capture unit
10−3 cm−1
m−1
E + 01
m−1
m−1
1.0* 1 1
Ci
Bq
3.7*
E + 10
Radioactivity
10−3 cm−1
*An asterisk indicates that the conversion factor is exact. † Conversion factors for length, area, and volume are based on the international foot. The international foot is longer by 2 parts in 1 million than the U.S. Survey foot (land-measurement use). NOTE: The following unit symbols are used in the table: Unit symbol
Name
Unit symbol
A a Bq C cd Ci d °C ° dyn F fc G g gr Gy H h ha Hz J K L, ᐉ, l
ampere annum (year) becquerel coulomb candela curie day degree Celsius degree dyne farad footcandle gauss gram grain gray henry hour hectare hertz joule kelvin liter
lm lx m min ′ N naut mi Oe Ω Pa rad r S s ″ sr St T t V W Wb
NOTE:
Name lumen lux meter minute minute newton U.S. nautical mile oersted ohm pascal radian revolution siemens second second steradian stokes tesla tonne volt watt weber
Copyright SPE-AIME, The SI Metric System of Units and SPE’s Tentative Metric Standard, Society of Petroleum Engineers, Dallas, 1977.
1-11
TABLE 1-5
Metric Conversion Factors as Exact Numerical Multiples of SI Units
The first two digits of each numerical entry represent a power of 10. For example, the entry “−02 2.54” expresses the fact that 1 in = 2.54 × 10−2 m. To convert from abampere abcoulomb abfarad abhenry abmho abohm abvolt acre ampere (international of 1948) angstrom are astronomical unit atmosphere bar barn barrel (petroleum 42 gal) barye British thermal unit (ISO/ TC 12) British thermal unit (International Steam Table) British thermal unit (mean) British thermal unit (thermochemical) British thermal unit (39°F) British thermal unit (60°F) bushel (U.S.) cable caliber calorie (International Steam Table) calorie (mean) calorie (thermochemical) calorie (15°C) calorie (20°C) calorie (kilogram, International Steam Table) calorie (kilogram, mean) calorie (kilogram, thermochemical) carat (metric) Celsius (temperature) centimeter of mercury (0°C) centimeter of water (4°C) chain (engineer’s) chain (surveyor’s or Gunter’s) circular mil cord coulomb (international of 1948) cubit cup curie day (mean solar) day (sidereal) degree (angle) denier (international) dram (avoirdupois) dram (troy or apothecary) dram (U.S. fluid) dyne electron volt erg Fahrenheit (temperature)
Multiply by
To convert from
To
Multiply by
ampere coulomb farad henry mho ohm volt meter2 ampere
To
+01 1.00 +01 1.00 +09 1.00 −09 1.00 +09 1.00 −09 1.00 −08 1.00 +03 4.046 856 −01 9.998 35
meter meter2 meter newton/meter2 newton/meter2 meter2 meter3 newton/meter2 joule
−10 1.00 +02 1.00 +11 1.495 978 +05 1.013 25 +05 1.00 −28 1.00 −01 1.589 873 −01 1.00 +03 1.055 06
joule
+03 1.055 04
joule joule
+03 1.055 87 +03 1.054 350
joule joule meter3 meter meter joule
+03 1.059 67 +03 1.054 68 −02 3.523 907 +02 2.194 56 −04 2.54 +00 4.1868
joule joule joule joule joule
+00 4.190 02 +00 4.184 +00 4.185 80 +00 4.181 90 +03 4.186 8
joule joule
+03 4.190 02 +03 4.184
kilogram kelvin newton/meter2 newton/meter2 meter meter
−04 2.00 tK = tc + 273.15 +03 1.333 22 +01 9.806 38 +01 3.048 +01 2.011 68
meter3 meter meter newton/meter2 lumen/meter2 candela/meter2 meter meter/second2 meter3 meter3 meter3 tesla tesla ampere turn meter3 meter3 degree (angular) radian kilogram kilogram meter meter2 henry meter3 watt watt watt watt watt watt second (mean solar) second (mean solar) kilogram kilogram meter newton/meter2 newton/meter2 newton/meter2 newton/meter2 joule 1/meter joule
−05 2.957 352 −01 3.048 −01 3.048 006 +03 2.988 98 +01 1.076 391 +00 3.426 259 +02 2.011 68 −02 1.00 −03 4.546 087 −03 4.404 883 −03 3.785 411 −09 1.00 −04 1.00 −01 7.957 747 −04 1.420 652 −04 1.182 941 −01 9.00 −02 1.570 796 −05 6.479 891 −03 1.00 −01 1.016 +04 1.00 +00 1.000 495 −01 2.384 809 +02 7.456 998 +03 9.809 50 +02 7.46 +02 7.354 99 +02 7.457 +02 7.460 43 +03 3.60 +03 3.590 170 +01 5.080 234 +01 4.535 923 −02 2.54 +03 3.386 389 +03 3.376 85 +02 2.490 82 +02 2.4884 +00 1.000 165 +02 1.00 +03 4.186 74
meter2 meter3 coulomb
−10 5.067 074 +00 3.624 556 −01 9.998 35
meter meter3 disintegration/second second (mean solar) second (mean solar) radian kilogram/meter kilogram kilogram meter3 newton joule joule kelvin
fluid ounce (U.S.) foot foot (U.S. survey) foot of water (39.2°F) footcandle footlambert furlong gal (galileo) gallon (U.K. liquid) gallon (U.S. dry) gallon (U.S. liquid) gamma gauss gilbert gill (U.K.) gill (U.S.) grad grad grain gram hand hectare henry (international of 1948) hogshead (U.S.) horsepower (550 ft lbf/s) horsepower (boiler) horsepower (electric) horsepower (metric) horsepower (U.K.) horsepower (water) hour (mean solar) hour (sidereal) hundredweight (long) hundredweight (short) inch inch of mercury (32°F) inch of mercury (60°F) inch of water (39.2°F) inch of water (60°F) joule (international of 1948) kayser kilocalorie (International Steam Table) kilocalorie (mean) kilocalorie (thermochemical) kilogram mass kilogram-force (kgf) kilopond-force kip knot (international) lambert lambert langley lbf (pound-force, avoirdupois) lbm (pound-mass, avoirdupois) league (British nautical) league (international nautical) league (statute) light-year link (engineer’s) link (surveyor’s or Gunter’s) liter lux maxwell meter micrometer mil mile (U.S. statute) mile (U.K. nautical) mile (international nautical) mile (U.S. nautical) millibar millimeter of mercury (0°C)
joule joule kilogram newton newton newton meter/second candela/meter2 candela/meter2 joule/meter2 newton
+03 4.190 02 +03 4.184 +00 1.00 +00 9.806 65 +00 9.806 65 +03 4.448 221 −01 5.144 444 +04 1/π +03 3.183 098 +04 4.184 +00 4.448 221
kilogram
−01 4.535 923
meter meter
+03 5.559 552 +03 5.556
meter meter meter meter meter3 lumen/meter2 weber wavelengths Kr 86 meter meter meter meter meter meter newton/meter2 newton/meter2
+03 4.828 032 +15 9.460 55 −01 3.048 −01 2.011 68 −03 1.00 +00 1.00 −08 1.00 +06 1.650 763 −06 1.00 −05 2.54 +03 1.609 344 +03 1.853 184 +03 1.852 +03 1.852 +02 1.00 +02 1.333 224
Fahrenheit (temperature)
Celsius
farad (international of 1948) faraday (based on carbon 12) faraday (chemical) faraday (physical) fathom fermi (femtometer)
farad coulomb
−01 4.572 −04 2.365 882 +10 3.70 +04 8.64 +04 8.616 409 −02 1.745 329 −07 1.111 111 −03 1.771 845 −03 3.887 934 −06 3.696 691 −05 1.00 −19 1.602 10 −07 1.00 tK = (5/9)(tF + 459.67) tc = (5/9)(tF − 32) −01 9.995 05 +04 9.648 70
coulomb coulomb meter meter
+04 9.649 57 +04 9.652 19 +00 1.828 8 −15 1.00
1-12
TABLE 1-5
Metric Conversion Factors as Exact Numerical Multiples of SI Units (Concluded)
The first two digits of each numerical entry represent a power of 10. For example, the entry “−02 2.54” expresses the fact that 1 in = 2.54 × 10−2. To convert from minute (angle) minute (mean solar) minute (sidereal) month (mean calendar) nautical mile (international) nautical mile (U.S.) nautical mile (U.K.) oersted ohm (international of 1948) ounce-force (avoirdupois) ounce-mass (avoirdupois) ounce-mass (troy or apothecary) ounce (U.S. fluid) pace parsec pascal peck (U.S.) pennyweight perch phot pica (printer’s) pint (U.S. dry) pint (U.S. liquid) point (printer’s) poise pole pound-force (lbf avoirdupois) pound-mass (lbm avoirdupois) pound-mass (troy or apothecary) poundal quart (U.S. dry) quart (U.S. liquid) rad (radiation dose absorbed) Rankine (temperature) rayleigh (rate of photon emission) rhe rod roentgen rutherford second (angle)
To
Multiply by
radian second (mean solar) second (mean solar) second (mean solar) meter meter meter ampere/meter ohm newton kilogram kilogram meter3 meter meter newton/meter2 meter3 kilogram meter lumen/meter2 meter meter3 meter3 meter (newton-second)/meter2 meter newton
−04 2.908 882 +01 6.00 +01 5.983 617 +06 2.628 +03 1.852 +03 1.852 +03 1.853 184 +01 7.957 747 +00 1.000 495 −01 2.780 138 −02 2.834 952 −02 3.110 347 −05 2.957 352 −01 7.62 +16 3.083 74 +00 1.00 −03 8.809 767 −03 1.555 173 +00 5.0292 +04 1.00 −03 4.217 517 −04 5.506 104 −04 4.731 764 −04 3.514 598 −01 1.00 +00 5.0292 +00 4.448 221
kilogram
−01 4.535 923
kilogram
−01 3.732 417
newton meter3 meter3 joule/kilogram
−01 1.382 549 −03 1.101 220 −04 9.463 529 −02 1.00
kelvin 1/second-meter2
tK = (5/9)tR +10 1.00
meter2/(newtonsecond) meter coulomb/kilogram disintegration/second radian
+01 1.00 +00 5.0292 −04 2.579 76 +06 1.00 −06 4.848 136
To
Multiply by
second (ephemeris) second (mean solar)
To convert from
second second (ephemeris)
second (sidereal) section scruple (apothecary) shake skein slug span statampere statcoulomb statfarad stathenry statmho statohm statute mile (U.S.) statvolt stere stilb stoke tablespoon teaspoon ton (assay) ton (long) ton (metric) ton (nuclear equivalent of TNT) ton (register) ton (short, 2000 lb) tonne torr (0°C) township unit pole volt (international of 1948) watt (international of 1948) yard year (calendar) year (sidereal) year (tropical) year 1900, tropical, Jan., day 0, hour 12 year 1900, tropical, Jan., day 0, hour 12
second (mean solar) meter2 kilogram second meter kilogram meter ampere coulomb farad henry mho ohm meter volt meter3 candela/meter2 meter2/second meter3 meter3 kilogram kilogram kilogram joule meter3 kilogram kilogram newton/meter2 meter2 weber volt watt meter second (mean solar) second (mean solar) second (mean solar) second (ephemeris)
+00 1.000 000 Consult American Ephemeris and Nautical Almanac −01 9.972 695 +06 2.589 988 −03 1.295 978 −08 1.00 +02 1.097 28 +01 1.459 390 −01 2.286 −10 3.335 640 −10 3.335 640 −12 1.112 650 +11 8.987 554 −12 1.112 650 +11 8.987 554 +03 1.609 344 +02 2.997 925 +00 1.00 +04 1.00 −04 1.00 −05 1.478 676 −06 4.928 921 −02 2.916 666 +03 1.016 046 +03 1.00 +09 4.20 +00 2.831 684 +02 9.071 847 +03 1.00 +02 1.333 22 +07 9.323 957 −07 1.256 637 +00 1.000 330 +00 1.000 165 −01 9.144 +07 3.1536 +07 3.155 815 +07 3.155 692 +07 3.155 692
second
+07 3.155 692
1-13
1-14 TABLE 1-6
Alphabetical Listing of Common Conversions
To convert from Acres Acres Acres Acre-feet Ampere-hours (absolute) Angstrom units Angstrom units Angstrom units Atmospheres Atmospheres Atmospheres Atmospheres Atmospheres Atmospheres Atmospheres Atmospheres Bags (cement) Barrels (cement) Barrels (oil) Barrels (oil) Barrels (U.S. liquid) Barrels (U.S. liquid) Barrels per day Bars Bars Bars Board feet Boiler horsepower Boiler horsepower B.t.u. B.t.u. B.t.u. B.t.u. B.t.u. B.t.u. B.t.u. B.t.u. B.t.u. B.t.u. B.t.u. per cubic foot B.t.u. per hour B.t.u. per minute B.t.u. per pound B.t.u. per pound per degree Fahrenheit B.t.u. per pound per degree Fahrenheit B.t.u. per second B.t.u. per square foot per hour B.t.u. per square foot per minute B.t.u. per square foot per second for a temperature gradient of 1°F. per inch
To
Multiply by
Square feet Square meters Square miles Cubic meters Coulombs (absolute) Inches Meters Microns Millimeters of mercury at 32°F Dynes per square centimeter Newtons per square meter Feet of water at 39.1°F Grams per square centimeter Inches of mercury at 32°F Pounds per square foot Pounds per square inch Pounds (cement) Pounds (cement) Cubic meters Gallons Cubic meters Gallons Gallons per minute Atmospheres Newtons per square meter Pounds per square inch Cubic feet B.t.u. per hour Kilowatts Calories (gram) Centigrade heat units (c.h.u. or p.c.u.) Foot-pounds Horsepower-hours Joules Liter-atmospheres Pounds carbon to CO2 Pounds water evaporated from and at 212°F Cubic foot-atmospheres Kilowatt-hours Joules per cubic meter Watts Horsepower Joules per kilogram Calories per gram per degree centigrade Joules per kilogram per degree Kelvin Watts Joules per square meter per second Kilowatts per square foot Calories, gram (15°C.), per square centimeter per second for a temperature gradient of 1°C. per centimeter
43,560 4074 0.001563 1233 3600 3.937 × 10−9 1 × 10−10 1 × 10−4 760 1.0133 × 106 101,325 33.90 1033.3 29.921 2116.3 14.696 94 376 0.15899 42 0.11924 31.5 0.02917 0.9869 1 × 105 14.504 1⁄12 33,480 9.803 252 0.55556 777.9 3.929 × 10−4 1055.1 10.41 6.88 × 10−5 0.001036 0.3676 2.930 × 10−4 37,260 0.29307 0.02357 2326 1 4186.8 1054.4 3.1546 0.1758 1.2405
To convert from Drams (avoirdupois) Dynes Ergs Faradays Fathoms Feet Feet per minute Feet per minute Feet per (second)2 Feet of water at 39.2°F. Foot-poundals Foot-poundals Foot-poundals Foot-pounds Foot-pounds Foot-pounds Foot-pounds Foot-pounds Foot-pounds Foot-pounds force Foot-pounds per second Foot-pounds per second Furlongs Gallons (U.S. liquid) Gallons Gallons Gallons Gallons Gallons Gallons per minute Gallons per minute Grains Grains Grains per cubic foot Grains per gallon Grams Grams Grams Grams Grams Grams Grams per cubic centimeter Grams per cubic centimeter Grams per liter Grams per liter Grams per square centimeter Grams per square centimeter Hectares Hectares Horsepower (British) Horsepower (British) Horsepower (British) Horsepower (British) Horsepower (British)
To Grams Newtons Joules Coulombs (abs.) Feet Meters Centimeters per second Miles per hour Meters per (second)2 Newtons per square meter B.t.u. Joules Liter-atmospheres B.t.u. Calories, gram Foot-poundals Horsepower-hours Kilowatt-hours Liter-atmospheres Joules Horsepower Kilowatts Miles Barrels (U.S. liquid) Cubic meters Cubic feet Gallons (Imperial) Liters Ounces (U.S. fluid) Cubic feet per hour Cubic feet per second Grams Pounds Grams per cubic meter Parts per million Drams (avoirdupois) Drams (troy) Grains Kilograms Pounds (avoirdupois) Pounds (troy) Pounds per cubic foot Pounds per gallon Grains per gallon Pounds per cubic foot Pounds per square foot Pounds per square inch Acres Square meters B.t.u. per minute B.t.u. per hour Foot-pounds per minute Foot-pounds per second Watts
Multiply by 1.7719 1 × 10−5 1 × 10−7 96,500 6 0.3048 0.5080 0.011364 0.3048 2989 3.995 × 10−5 0.04214 4.159 × 10−4 0.0012856 0.3239 32.174 5.051 × 10−7 3.766 × 10−7 0.013381 1.3558 0.0018182 0.0013558 0.125 0.03175 0.003785 0.13368 0.8327 3.785 128 8.021 0.002228 0.06480 1⁄ 7000 2.2884 17.118 0.5644 0.2572 15.432 0.001 0.0022046 0.002679 62.43 8.345 58.42 0.0624 2.0482 0.014223 2.471 10,000 42.42 2545 33,000 550 745.7
B.t.u. (60°F.) per degree Fahrenheit Bushels (U.S. dry) Bushels (U.S. dry) Calories, gram Calories, gram Calories, gram Calories, gram Calories, gram Calories, gram, per gram per degree C. Calories, kilogram Calories, kilogram per second Candle power (spherical) Carats (metric) Centigrade heat units Centimeters Centimeters Centimeters Centimeters Centimeters Centimeters of mercury at 0°C. Centimeters of mercury at 0°C. Centimeters of mercury at 0°C Centimeters of mercury at 0°C. Centimeters of mercury at 0°C. Centimeters per second Centimeters of water at 4°C. Centistokes Circular mils Circular mils Circular mils Cords Cubic centimeters Cubic centimeters Cubic centimeters Cubic centimeters Cubic feet Cubic feet Cubic feet Cubic feet Cubic feet Cubic feet Cubic foot-atmospheres Cubic foot-atmospheres Cubic feet of water (60°F.) Cubic feet per minute Cubic feet per minute Cubic feet per second Cubic feet per second Cubic inches Cubic yards Curies Curies Degrees Drams (apothecaries’ or troy)
Calories per degree centigrade Cubic feet Cubic meters B.t.u. Foot-pounds Joules Liter-atmospheres Horsepower-hours Joules per kilogram per degree Kelvin Kilowatt-hours Kilowatts Lumens Grams B.t.u. Angstrom units Feet Inches Meters Microns Atmospheres Feet of water at 39.1°F. Newtons per square meter Pounds per square foot Pounds per square inch Feet per minute Newtons per square meter Square meters per second Square centimeters Square inches Square mils Cubic feet Cubic feet Gallons Ounces (U.S. fluid) Quarts (U.S. fluid) Bushels (U.S.) Cubic centimeters Cubic meters Cubic yards Gallons Liters Foot-pounds Liter-atmospheres Pounds Cubic centimeters per second Gallons per second Gallons per minute Million gallons per day Cubic meters Cubic meters Disintegrations per minute Coulombs per minute Radians Grams
453.6 1.2444 0.03524 3.968 × 10−3 3.087 4.1868 4.130 × 10−2 1.5591 × 10−6 4186.8 0.0011626 4.185 12.556 0.2 1.8 1 × 108 0.03281 0.3937 0.01 10,000 0.013158 0.4460 1333.2 27.845 0.19337 1.9685 98.064 1 × 10−6 5.067 × 10−6 7.854 × 10−7 0.7854 128 3.532 × 10−5 2.6417 × 10−4 0.03381 0.0010567 0.8036 28,317 0.028317 0.03704 7.481 28.316 2116.3 28.316 62.37 472.0 0.1247 448.8 0.64632 1.6387 × 10−5 0.76456 2.2 × 1012 1.1 × 1012 0.017453 3.888
Horsepower (British) Horsepower (British) Horsepower (British) Horsepower (metric) Horsepower (metric) Hours (mean solar) Inches Inches of mercury at 60°F Inches of water at 60°F Joules (absolute) Joules (absolute) Joules (absolute) Joules (absolute) Joules (absolute) Joules (absolute) Kilocalories Kilograms Kilograms force Kilograms per square centimeter Kilometers Kilowatt-hours Kilowatt-hours Kilowatts Knots (international) Knots (nautical miles per hour) Lamberts Liter-atmospheres Liter-atmospheres Liters Liters Liters Lumens Micromicrons Microns Microns Miles (nautical) Miles (nautical) Miles Miles Miles per hour Miles per hour Milliliters Millimeters Millimeters of mercury at 0°C. Millimicrons Mils Mils Minims (U.S.) Minutes (angle) Minutes (mean solar) Newtons Ounces (avoirdupois) Ounces (avoirdupois) Ounces (U.S. fluid) Ounces (troy)
Horsepower (metric) Pounds carbon to CO2 per hour Pounds water evaporated per hour at 212°F Foot-pounds per second Kilogram-meters per second Seconds Meters Newtons per square meter Newtons per square meter B.t.u. (mean) Calories, gram (mean) Cubic foot-atmospheres Foot-pounds Kilowatt-hours Liter-atmospheres Joules Pounds (avoirdupois) Newtons Pounds per square inch Miles B.t.u. Foot-pounds Horsepower Meters per second Miles per hour Candles per square inch Cubic foot-atmospheres Foot-pounds Cubic feet Cubic meters Gallons Watts Microns Angstrom units Meters Feet Miles (U.S. statute) Feet Meters Feet per second Meters per second Cubic centimeters Meters Newtons per square meter Microns Inches Meters Cubic centimeters Radians Seconds Kilograms Kilograms Ounces (troy) Cubic meters Ounces (apothecaries’)
1.0139 0.175 2.64 542.47 75.0 3600 0.0254 3376.9 248.84 9.480 × 10−4 0.2389 0.3485 0.7376 2.7778 × 10−7 0.009869 4186.8 2.2046 9.807 14.223 0.6214 3414 2.6552 × 106 1.3410 0.5144 1.1516 2.054 0.03532 74.74 0.03532 0.001 0.26418 0.001496 −6 1 × 10 1 × 104 1 × 10−6 6080 1.1516 5280 1609.3 1.4667 0.4470 1 0.001 133.32 0.001 0.001 2.54 × 10−5 0.06161 2.909 × 10−4 60 0.10197 0.02835 0.9115 2.957 × 10−5 1.000
1-15
1-16
TABLE 1-6
Alphabetical Listing of Common Conversions (Concluded)
To convert from Pints (U.S. liquid) Poundals Pounds (avoirdupois) Pounds (avoirdupois) Pounds (avoirdupois) Pounds per cubic foot Pounds per cubic foot Pounds per square foot Pounds per square foot Pounds per square inch Pounds per square inch Pounds per square inch Pounds force Pounds force per square foot Pounds water evaporated from and at 212°F. Pound-centigrade units (p.c.u.) Quarts (U.S. liquid) Radians Revolutions per minute Seconds (angle) Slugs Slugs Slugs
To Cubic meters Newtons Grains Kilograms Pounds (troy) Grams per cubic centimeter Kilograms per cubic meter Atmospheres Kilograms per square meter Atmospheres Kilograms per square centimeter Newtons per square meter Newtons Newtons per square meter Horsepower-hours B.t.u. Cubic meters Degrees Radians per second Radians Gee pounds Kilograms Pounds
Multiply by 4.732 × 10−4 0.13826 7000 0.45359 1.2153 0.016018 16.018 4.725 × 10−4 4.882 0.06805 0.07031 6894.8 4.4482 47.88 0.379 1.8 9.464 × 10−4 57.30 0.10472 4.848 × 10−6 1 14.594 32.17
To convert from Square centimeters Square feet Square feet per hour Square inches Square inches Square yards Stokes Tons (long) Tons (long) Tons (metric) Tons (metric) Tons (metric) Tons (short) Tons (short) Tons (refrigeration) Tons (British shipping) Tons (U.S. shipping) Torr (mm. mercury, 0°C.) Watts Watts Watts Watt-hours Yards
To Square feet Square meters Square meters per second Square centimeters Square meters Square meters Square meters per second Kilograms Pounds Kilograms Pounds Tons (short) Kilograms Pounds B.t.u. per hour Cubic feet Cubic feet Newtons per square meter B.t.u. per hour Joules per second Kilogram-meters per second Joules Meters
Multiply by 0.0010764 0.0929 2.581 × 10−5 6.452 6.452 × 10−4 0.8361 1 × 10−4 1016 2240 1000 2204.6 1.1023 907.18 2000 12,000 42.00 40.00 133.32 3.413 1 0.10197 3600 0.9144
TABLE 1-7 Mass (M)
Length (L)
Common Units and Conversion Factors* 1 pound mass = 453.5924 grams = 0.45359 kilograms = 7000 grains 1 slug = 32.174 pounds mass 1 ton (short) = 2000 pounds mass 1 ton (long) = 2240 pounds mass 1 ton (metric) = 1000 kilograms = 2204.62 pounds mass 1 pound mole = 453.59 gram moles = 30.480 centimeters = 0.3048 meters 1 inch = 2.54 centimeters = 0.0254 meters 1 mile (U.S.) = 1.60935 kilometers 1 yard = 0.9144 meters 1 foot
Area (L2)
Volume (L3)
1 square foot = 929.0304 square centimeters = 0.09290304 square meters 1 square inch = 6.4516 square centimeters 1 square yard = 0.836127 square meters 1 cubic foot
1 gallon Time (θ)
= 28,316.85 cubic centimeters = 0.02831685 cubic meters = 28.31685 liters = 7.481 gallons (U.S.) = 3.7853 liters = 231 cubic inches
1 hour = 60 minutes = 3600 seconds Temperature (T) 1 centigrade or Celsius degree = 1.8 Fahrenheit degree Temperature, Kelvin = T°C + 273.15 Temperature, Rankine = T°F + 459.7 Temperature, Fahrenheit = 9/5 T°C + 32 Temperature, centigrade or Celsius = 5/9 (T°F − 32) Temperature, Rankine = 1.8 T K Force (F) 1 pound force = 444,822.2 dynes = 4.448222 Newtons = 32.174 poundals 2 Pressure (F/L ) Normal atmospheric pressure
1 atm = 760 millimeters of mercury at 0°C (density 13.5951 g/cm3) = 29.921 inches of mercury at 32°F = 14.696 pounds force/square inch = 33.899 feet of water at 39.1°F = 1.01325 × 106 dynes/square centimeter = 1.01325 × 105 Newtons/square meter Density (M/L3) 1 pound mass/cubic foot = 0.01601846 grams/cubic centimeter = 16.01846 kilogram/cubic meter Energy (H or FL) 1 British thermal unit = 251.98 calories = 1054.4 joules = 777.97 foot-pounds force = 10.409 liter-atmospheres = 0.2930 watt-hour Diffusivity (L2/θ) 1 square foot/hour = 0.258 cm2/s = 2.58 × 10−5 m2/s Viscosity (M/Lθ) 1 pound mass/foot hour = 0.00413 g/cm s 0.000413 kg/m s 1 centipoise = 0.01 poise = 0.01 g/cm s = 0.001 kg/m s = 0.000672 lbm/ft s = 0.0000209 lbfs/ft2 2 Thermal conductivity [H/θL (T/L)] 2 1 Btu/hr ft (°F/ft) = 0.00413 cal/s cm2 (°C/cm) = 1.728 J/s m2 (°C/m) Heat transfer coefficient 1 Btu/hr ft2 °F = 5.678 J/s m2 °C Heat capacity (H/MT) 1 Btu/lbm °F = 1 cal/g °C = 4184 J/kg °C Gas constant 1.987 Btu/lbm mole °R = 1.987 cal/mol K = 82.057 atm cm3/mol K = 0.7302 atm ft3/lb mole °F = 10.73 (lbf /in.2) (ft3)/lb mole °R = 1545 (lbf /ft2) (ft3)/lb mole °R = 8.314 (N/m2) (m3)/mol K Gravitational acceleration g = 9.8066 m/s2 = 32.174 ft/s2
NOTE:
U.S. customary units, or British units, on left and SI units on right. *Adapted from Faust et al., Principles of Unit Operations, John Wiley and Sons, 1980.
TABLE 1-8
Kinematic-Viscosity Conversion Formulas
Viscosity scale Saybolt Universal Saybolt Furol Redwood No. 1 Redwood Admiralty Engler
Range of t, sec 32 < t < 100 t > 100 25 < t < 40 t > 40 34 < t < 100 t > 100
Kinematic viscosity, stokes 0.00226t − 1.95/t 0.00220t − 1.35/t 0.0224t − 1.84/t 0.0216t − 0.60/t 0.00260t − 1.79/t 0.00247t − 0.50/t 0.027t − 20/t 0.00147t − 3.74/t
TABLE 1-9 Temp. scale
Values of the Gas-Law Constant Press. units
Vol. units
Kelvin atm. atm. mm. Hg bar kg/cm2 atm mm Hg
cm3 liters liters liters liters ft3 ft3
atm in Hg mm Hg lb/in2abs lb/ft2abs
ft3 ft3 ft3 ft3 ft3
Rankine
Wt. units
Energy units*
R
g-moles g-moles g-moles g-moles g-moles g-moles g-moles g-moles lb-moles lb-moles lb-moles lb-moles lb-moles lb-moles lb-moles lb-moles lb-moles lb-moles lb-moles
calories joules (abs) joules (int) atm cm3 atm liters mm Hg-liters bar-liters kg/(cm2)(liters) atm-ft3 mm Hg-ft3 chu or pcu Btu hp-hr kw-hr atm-ft3 in Hg-ft3 mm Hg-ft3 (lb)(ft3)/in2 ft-lb
1.9872 8.3144 8.3130 82.057 0.08205 62.361 0.08314 0.08478 1.314 998.9 1.9872 1.9872 0.0007805 0.0005819 0.7302 21.85 555.0 10.73 1545.0
*Energy units are the product of pressure units and volume units. 1-17
TABLE 1-10 United States Customary System of Weights and Measures Linear Measure 12 inches (in) or (″) = 1 foot (ft) or (′) 3 feet = 1 yard (yd) 16.5 feet = 1 rod (rd) 5.5 yards
5280 feet = 1 mile (mi) 320 rods 1 mil = 0.001 inch Nautical:
Square Measure 144 sq. inches (sq. in) or (in ) or (ⵧ″) = 1 sq. foot (ft2) or (ⵧ′) 9 sq. feet (ft2) (ⵧ′) = 1 sq. yard (yd2) 30.25 sq. yards = 1 sq. rod, pole, or perch 10 sq. chains 160 sq. rods = = 1 acre 43,560 sq. ft 640 acres = 1 sq. mile = 1 section 1 circular inch (area of circle of 1 inch diameter) = 0.7854 sq. inch 1 sq. inch = 1.2732 circular inch 1 circular mil = area of circle of 0.001 inch diameter 1,000,000 circular mils = 1 circular inch 2
Circular Measure 60 seconds (″) (sec) = 1 minute (min) or (′) 60 minutes (′) = 1 degree (°) 90 degrees (°) = 1 quadrant 360 degrees (°) = 1 circumference = 1 radian (rad.) 57.29578 degrees = 57° 17′ 44.81″
Volume Measure Solid:
1728 cubic in (cu. in) (in3) = 1 cubic foot (cu. ft)(ft3) 27 cu. ft = 1 cubic yard (cu. yd) Dry Measure: 2 pints = 1 quart 8 quarts = 1 peck 4 pecks = 1 bushel 1 United States Winchester bushel = 2150.42 cubic inches Liquid: 4 gills = 1 pint (pt) 2 pints = 1 quart (qt) 4 quarts = 1 gallon (gal) 7.4805 gallons = 1 cubic foot Apothecaries’ Liquid: 60 minims (min. or ) = 1 fluid dram or drachm 8 drams ( ) = 1 fluid ounce 16 ounces (oz. ) = 1 pint Avoirdupois Weight 16 drams = 437.5 grains = 1 ounce (oz) 16 ounces = 7000 grains = 1 pound (lb) 100 pounds = 1 hundredweight (cwt) 2000 pounds = 1 short ton: 2240 pounds = 1 long ton Troy Weight 24 grains = 1 pennyweight (dwt) 20 pennyweights = 1 ounce (oz) 12 ounces = 1 pound (lb) Apothecaries’ Weight 20 grains (gr) = 1 scruple ( ) 3 scruples = 1 dram ( ) 8 drams = 1 ounce ( ) 12 ounces = 1 pound (lb)
1-18
Temperature Conversion Formulas
°F = (°C × 5/9) + 32 °C = (°F − 32) × 5/9 °R = °F + 459.69 °K = °C + 273.15 °K = °R × 5/9 Temperature difference, T °F = °C × 9/5 NOTE: An extensive table of temperature conversions may be found in the sixth edition of the Handbook (Table 1-12).
6080.2 feet = 1 nautical mile 6 feet = 1 fathom 120 fathoms = 1 cable length 1 knot = 1 nautical mile per hour 60 nautical miles = 1° of latitude
TABLE 1-11
TABLE 1-12 Alpha Beta Gamma Delta Epsilon Zeta Eta Theta Iota Kappa Lambda Mu
Greek Alphabet
= Α, α = A, a = Β, β = B, b = Γ, γ = G, g = ∆, δ = D, d = Ε, ε = E, e = Ζ, ζ = Z, z = Η, η = E, e = Θ, θ = Th, th = Ι, = I, i = Κ, κ = K, k = Λ, λ = L, l = Μ, µ = M, m
Nu Xi Omicron Pi Rho Sigma Tau Upsilon Phi Chi Psi Omega
= Ν, ν = N, n = Ξ, ξ = X, x = Ο, ο = O, o = Π, π = P, p = Ρ, ρ = R, r = Σ, σ = S, s = Τ, τ = T, t = , υ = U, u = Φ, φ = Ph, ph = Χ, χ = Ch, ch = Ψ, ψ = Ps, ps = Ω, ω = O, o
TABLE 1-13
Specific Gravity, Degrees Baumé, Degrees API, Degrees Twaddell, Pounds per Gallon, Pounds per Cubic Foot* 145 140 sp gr 60°/60°F − 1 141.5 °Bé = 145 − (heavier than H2O); °Bé = − 130 (lighter than H2O); °Tw = °API = − 131.5 sp gr sp gr 0.005 sp gr Lb per gal at 60°F wt in air
Lb per ft3 at 60°F wt in air
Sp gr 60°/ 60°
°Bé
104.33 102.38 100.47 98.58 96.73
4.9929 5.0346 5.0763 5.1180 5.1597
37.350 37.662 37.973 38.285 38.597
0.700 .705 .710 .715 .720
70.00 68.58 67.18 65.80 64.44
94.00 92.22 90.47 88.75 87.05
94.90 93.10 91.33 89.59 87.88
5.2014 5.2431 5.2848 5.3265 5.3682
39.910 39.222 39.534 39.845 40.157
.725 .730 .735 .740 .745
.650 .655 .660 .665 .670
85.38 83.74 82.12 80.53 78.96
86.19 84.53 82.89 81.28 79.69
5.4098 5.4515 5.4932 5.5349 5.5766
40.468 40.780 41.092 41.404 41.716
.675 .680 .685 .690 .695
77.41 75.88 74.38 72.90 71.44
78.13 76.59 75.07 73.57 72.10
5.6183 5.6600 5.7017 5.7434 5.7851
42.028 42.340 42.652 42.963 43.275
Lb per ft3 at 60°F wt in air
Sp gr 60°/ 60°
°Bé
Sp gr 60°/ 60°
°Bé
°API
0.600 .605 .610 .615 .620
103.33 101.40 99.51 97.64 95.81
.625 .630 .635 .640 .645
°API
Lb per gal at 60°F wt in air
Lb per ft3 at 60°F wt in air
Sp gr 60°/ 60°
°Bé
°API
70.64 69.21 67.80 66.40 65.03
5.8268 5.8685 5.9101 5.9518 5.9935
43.587 43.899 44.211 44.523 44.834
0.800 .805 .810 .815 .820
45.00 43.91 42.84 41.78 40.73
45.38 44.28 43.19 42.12 41.06
63.10 61.78 60.48 59.19 57.92
63.67 62.34 61.02 59.72 58.43
6.0352 6.0769 6.1186 6.1603 6.2020
45.146 45.458 45.770 46.082 46.394
.825 .830 .835 .840 .845
39.70 38.67 37.66 36.67 35.68
.750 .755 .760 .765 .770
56.67 55.43 54.21 53.01 51.82
57.17 55.92 54.68 53.47 52.27
6.2437 6.2854 6.3271 6.3688 6.4104
46.706 47.018 47.330 47.642 47.953
.850 .855 .860 .865 .870
.775 .780 .785 .790 .795
50.65 49.49 48.34 47.22 46.10
51.08 49.91 48.75 47.61 46.49
6.4521 6.4938 6.5355 6.5772 6.6189
47.265 48.577 48.889 49.201 49.513
.875 .880 .885 .890 .895
Lb per ft3 at 60°F wt in air
Sp gr 60°/ 60°
Lb per gal at 60°F wt in air
Lb per ft3 at 60°F wt in air
Sp gr 60°/ 60°
°Bé
°API
Lb per gal at 60°F wt in air
6.6606 6.7023 6.7440 6.7857 6.8274
49.825 50.137 50.448 50.760 51.072
0.900 .905 .910 .915 .920
25.56 24.70 23.85 23.01 22.17
25.72 24.85 23.99 23.14 22.30
7.4944 7.5361 7.5777 7.6194 7.6612
56.062 56.374 56.685 56.997 57.310
40.02 38.98 37.96 36.95 35.96
6.8691 6.9108 6.9525 6.9941 7.0358
51.384 51.696 52.008 52.320 52.632
.925 .930 .935 .940 .945
21.35 20.54 19.73 18.94 18.15
21.47 20.65 19.84 19.03 18.24
7.7029 7.7446 7.7863 7.8280 7.8697
57.622 57.934 58.246 58.557 58.869
34.71 33.74 32.79 31.85 30.92
34.97 34.00 33.03 32.08 31.14
7.0775 7.1192 7.1609 7.2026 7.2443
52.943 53.255 53.567 53.879 54.191
.950 .955 .960 .965 .970
17.37 16.60 15.83 15.08 14.33
17.45 16.67 15.90 15.13 14.38
7.9114 7.9531 7.9947 8.0364 8.0780
59.181 59.493 59.805 60.117 60.428
30.00 29.09 28.19 27.30 26.42
30.21 29.30 28.39 27.49 26.60
7.2860 7.3277 7.3694 7.4111 7.4528
54.503 54.815 55.127 55.438 55.750
.975 .980 .985 .990 .995 1.000
13.59 12.86 12.13 11.41 10.70 10.00
13.63 12.89 12.15 11.43 10.71 10.00
8.1197 8.1615 8.2032 8.2449 8.2866 8.3283
60.740 61.052 61.364 61.676 61.988 62.300 Lb per ft3 at 60°F. wt. in air
°Tw
Lb per gal at 60°F wt in air
°Tw
Lb per gal at 60°F wt in air
°Bé
°Tw
Lb per gal at 60°F wt in air
°Bé
°Tw
Lb per gal at 60°F wt in air
1.005 1.010 1.015 1.020 1.025
0.72 1.44 2.14 2.84 3.54
1 2 3 4 5
8.3700 8.4117 8.4534 8.4950 8.5367
62.612 62.924 63.236 63.547 63.859
1.255 1.260 1.265 1.270 1.275
29.46 29.92 30.38 30.83 31.27
51 52 53 54 55
10.4546 10.4963 10.5380 10.5797 10.6214
78.206 78.518 78.830 79.141 79.453
1.505 1.510 1.515 1.520 1.525
48.65 48.97 49.29 49.61 49.92
101 102 103 104 105
12.5392 12.5809 12.6226 12.6643 12.7060
93.800 94.112 94.424 94.735 95.047
1.755 1.760 1.765 1.770 1.775
62.38 62.61 62.85 63.08 63.31
151 152 153 154 155
14.6238 14.6655 14.7072 14.7489 14.7906
109.394 109.705 110.017 110.329 110.641
1.030 1.035 1.040 1.045 1.050
4.22 4.90 5.58 6.24 6.91
6 7 8 9 10
8.5784 8.6201 8.6618 8.7035 8.7452
64.171 64.483 64.795 65.107 65.419
1.280 1.285 1.290 1.295 1.300
31.72 32.16 32.60 33.03 33.46
56 57 58 59 60
10.6630 10.7047 10.7464 10.7881 10.8298
79.765 80.077 80.389 80.701 81.013
1.530 1.535 1.540 1.545 1.550
50.23 50.54 50.84 51.15 51.45
106 107 108 109 110
12.7477 12.7894 12.8310 12.8727 12.9144
95.359 95.671 95.983 96.295 96.606
1.780 1.785 1.790 1.795 1.800
63.54 63.77 63.99 64.22 64.44
156 157 158 159 160
14.8323 14.8740 14.9157 14.9574 14.9990
110.953 111.265 111.577 111.889 112.200
1.055 1.060 1.065 1.070 1.075
7.56 8.21 8.85 9.49 10.12
11 12 13 14 15
8.7869 8.8286 8.8703 8.9120 8.9537
65.731 66.042 66.354 66.666 66.978
1.305 1.310 1.315 1.320 1.325
33.89 34.31 34.73 35.15 35.57
61 62 63 64 65
10.8715 10.9132 10.9549 10.9966 11.0383
81.325 81.636 81.948 82.260 82.572
1.555 1.560 1.565 1.570 1.575
51.75 52.05 52.35 52.64 52.94
111 112 113 114 115
12.9561 12.9978 13.0395 13.0812 13.1229
96.918 97.230 97.542 97.854 98.166
1.805 1.810 1.815 1.820 1.825
64.67 64.89 65.11 65.33 65.55
161 162 163 164 165
15.0407 15.0824 15.1241 15.1658 15.2075
112.512 112.824 113.136 113.448 113.760
1.080 1.085 1.090 1.095 1.100
10.74 11.36 11.97 12.58 13.18
16 17 18 19 20
8.9954 9.0371 9.0787 9.1204 9.1621
67.290 67.602 67.914 68.226 68.537
1.330 1.335 1.340 1.345 1.350
35.98 36.39 36.79 37.19 37.59
66 67 68 69 70
11.0800 11.1217 11.1634 11.2051 11.2467
82.884 83.196 83.508 83.820 84.131
1.580 1.585 1.590 1.595 1.600
53.23 53.52 53.81 54.09 54.38
116 117 118 119 120
13.1646 13.2063 13.2480 13.2897 13.3313
98.478 98.790 99.102 99.414 99.725
1.830 1.835 1.840 1.845 1.850
65.77 65.98 66.20 66.41 66.62
166 167 168 169 170
15.2492 15.2909 15.3326 15.3743 15.4160
114.072 114.384 114.696 115.007 115.318
1.105 1.110 1.115 1.120 1.125
13.78 14.37 14.96 15.54 16.11
21 22 23 24 25
9.2038 9.2455 9.2872 9.3289 9.3706
68.849 69.161 69.473 69.785 70.097
1.355 1.360 1.365 1.370 1.375
37.99 38.38 38.77 39.16 39.55
71 72 73 74 75
11.2884 11.3301 11.3718 11.4135 11.4552
84.443 84.755 85.067 85.379 85.691
1.605 1.610 1.615 1.620 1.625
54.66 54.94 55.22 55.49 55.77
121 122 123 124 125
13.3730 13.4147 13.4564 13.4981 13.5398
100.037 100.349 100.661 100.973 101.285
1.855 1.860 1.865 1.870 1.875
66.83 67.04 67.25 67.46 67.67
171 172 173 174 175
15.4577 15.4993 15.5410 15.5827 15.6244
115.630 115.943 116.255 116.567 116.879
1.130 1.135 1.140 1.145 1.150
16.68 17.25 17.81 18.36 18.91
26 27 28 29 30
9.4123 9.4540 9.4957 9.5374 9.5790
70.409 70.721 71.032 71.344 71.656
1.380 1.385 1.390 1.395 1.400
39.93 40.31 40.68 41.06 41.43
76 77 78 79 80
11.4969 11.5386 11.5803 11.6220 11.6637
86.003 86.315 86.626 86.938 87.250
1.630 1.635 1.640 1.645 1.650
56.04 56.32 56.59 56.85 57.12
126 127 128 129 130
13.5815 13.6232 13.6649 13.7066 13.7483
101.597 101.909 102.220 102.532 102.844
1.880 1.885 1.890 1.895 1.900
67.87 68.08 68.28 68.48 68.68
176 177 178 179 180
15.6661 15.7078 15.7495 15.7912 15.8329
117.191 117.503 117.814 118.126 118.438
1.155 1.160 1.165 1.170 1.175
19.46 20.00 20.54 21.07 21.60
31 32 33 34 35
9.6207 9.6624 9.7041 9.7458 9.7875
71.968 72.280 72.592 72.904 73.216
1.405 1.410 1.415 1.420 1.425
41.80 42.16 42.53 42.89 43.25
81 82 83 84 85
11.7054 11.7471 11.7888 11.8304 11.8721
87.562 87.874 88.186 88.498 88.810
1.655 1.660 1.665 1.670 1.675
57.39 57.65 57.91 58.17 58.43
131 132 133 134 135
13.7900 13.8317 13.8734 13.9150 13.9567
103.156 103.468 103.780 104.092 104.404
1.905 1.910 1.915 1.920 1.925
68.88 69.08 69.28 69.48 69.68
181 182 183 184 185
15.8746 15.9163 15.9580 15.9996 16.0413
118.740 119.062 119.374 119.686 119.998
1.180 1.185 1.190 1.195 1.200
22.12 22.64 23.15 23.66 24.17
36 37 38 39 40
9.8292 9.8709 9.9126 9.9543 9.9960
73.528 73.840 74.151 74.463 74.775
1.430 1.435 1.440 1.445 1.450
43.60 43.95 44.31 44.65 45.00
86 87 88 89 90
11.9138 11.9555 11.9972 12.0389 12.0806
89.121 89.433 89.745 90.057 90.369
1.680 1.685 1.690 1.695 1.700
58.69 58.95 59.20 59.45 59.71
136 137 138 139 140
13.9984 14.0401 14.0818 14.1235 14.1652
104.715 105.027 105.339 105.651 105.963
1.930 1.935 1.940 1.945 1.950
69.87 70.06 70.26 70.45 70.64
186 187 188 189 190
16.0830 16.1247 16.1664 16.2081 16.2498
120.309 120.621 120.933 121.245 121.557
1.205 1.210 1.215 1.220 1.225
24.67 25.17 25.66 26.15 26.63
41 42 43 44 45
10.0377 10.0793 10.1210 10.1627 10.2044
75.087 75.399 75.711 76.022 76.334
1.455 1.460 1.465 1.470 1.475
45.34 45.68 46.02 46.36 46.69
91 92 93 94 95
12.1223 12.1640 12.2057 12.2473 12.2890
90.681 90.993 91.305 91.616 91.928
1.705 1.710 1.715 1.720 1.725
59.96 60.20 60.45 60.70 60.94
141 142 143 144 145
14.2069 14.2486 14.2903 14.3320 14.3737
106.275 106.587 106.899 107.210 107.522
1.955 1.960 1.965 1.970 1.975
70.83 71.02 71.21 71.40 71.58
191 192 193 194 195
16.2915 16.3332 16.3749 16.4166 16.4583
121.869 122.181 122.493 122.804 123.116
1.230 1.235 1.240 1.245 1.250
27.11 27.59 28.06 28.53 29.00
46 47 48 49 50
10.2461 10.2878 10.3295 10.3712 10.4129
76.646 76.958 77.270 77.582 77.894
1.480 1.485 1.490 1.495 1.500
47.03 47.36 47.68 48.01 48.33
96 97 98 99 100
12.3307 12.3724 12.4141 12.4558 12.4975
92.240 92.552 92.864 93.176 93.488
1.730 1.735 1.740 1.745 1.750
61.18 61.34 61.67 61.91 62.14
146 147 148 149 150
14.4153 14.4570 14.4987 14.5404 14.5821
107.834 108.146 108.458 108.770 109.082
1.980 1.985 1.990 1.995 2.000
71.77 71.95 72.14 72.32 72.50
196 197 198 199 200
16.5000 16.5417 16.5833 16.6250 16.6667
123.428 123.740 124.052 124.364 124.676
Sp gr 60°/ 60°
°Bé
Lb per ft3 at 60°F wt in air
Sp gr 60°/ 60°
Lb per ft3 at 60°F. wt. in air
*Prepared by Lewis V. Judson, Ph.D., Chief of Length Section of National Bureau of Standards with the advice and assistance of E. L. Peffer, B.S., A.M., late Chief of Capacity and Density Section, National Bureau of Standards.
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TABLE 1-14
Fundamental Physical Constants
1 sec = 1.00273791 sidereal seconds g0 = 9.80665 m/sec2 1 liter = 0.001 cu. m 1 atm = 101,325 newtons/sq m 1 mm Hg (pressure) = (1⁄ 760) atm = 133.3224 newtons/sq m 1 int ohm = 1.000495 0.000015 abs ohm 1 int amp = 0.999835 0.000025 abs amp 1 int coul = 0.999835 0.000025 abs coul 1 int volt = 1.000330 0.000029 abs volt 1 int watt = 1.000165 0.000052 abs watt 1 int joule = 1.000165 0.000052 abs joule T0°C = 273.150 0.010°K (PV)0°CP=0 = (RT)0°C = 2271.16 0.04 abs joule/mole = 22,414.6 0.4 cu. cm atm/mole = 22.4146 0.0004 liter atm/mole R = 8.31439 0.00034 abs joule/deg mole = 1.98719 0.00013 cal/deg mole = 82.0567 0.0034 cu. cm atm/deg mole = 0.0820567 0.0000034 liter atm/deg mole ln 10 = 2.302585 R ln 10 = 19.14460 0.00078 abs joule/deg mole = 4.57567 0.00030 cal/deg mole N = (6.02283 0.0022) × 1023/mole h = (6.6242 0.0044) × 10−34 joule sec c = (2.99776 0.00008) × 108 m/sec (h2/8π2k) = (4.0258 0.0037) × 10−39 g sq cm deg (h/8π2c) = (2.7986 0.0018) × 10−39 g cm Z = Nhc = 11.9600 0.0036 abs joule cm/mole = 2.85851 0.0009 cal cm/mole (Z/R) = (hc/k) = c2 = 1.43847 0.00045 cm deg Ᏺ = 96,501.2 10.0 int coul/g-equiv or int joule/int volt g-equiv = 96,485.3 10.0 abs coul/g-equiv or abs joule/abs volt g-equiv = 23,068.1 2.4 cal/int volt g-equiv = 23,060.5 2.4 cal/abs volt g-equiv e = (1.60199 0.00060) × 10−19 abs coul = (1.60199 0.00060) × 10−20 abs emu = (4.80239 0.00180) × 10−10 abs esu 1 int electron-volt/molecule = 96,501.2 10 int joule/mole = 23,068.1 2.4 cal/mole 1 abs electron-volt/molecule = 96,485.3 10. abs joule/mole = 23,060.5 2.4 cal/mole 1 int electron-volt = (1.60252 0.00060) × 10−12 erg 1 abs electron-volt = (1.60199 0.00060) × 10−12 erg hc = (1.23916 0.00032) × 10−4 int electron-volt cm = (1.23957 0.00032) × 10−4 abs electron-volt cm k = (8.61442 0.00100) × 10−5 int electron-volt/deg = (8.61727 0.00100) × 10−5 abs electron-volt/deg = (R/N) = (1.38048 0.00050) × 10−23 joule/deg 1 IT cal = (1⁄ 860) = 0.00116279 int watt-hr = 4.18605 int joule = 4.18674 abs joule = 1.000654 cal 1 cal = 4.1840 abs joule = 4.1833 int joule = 41.2929 0.0020 cu. cm atm = 0.0412929 0.0000020 liter atm 1 IT cal/g = 1.8 Btu/lb 1 Btu = 251.996 IT cal = 0.293018 int watt-hr = 1054.866 int joule = 1055.040 abs joule = 252.161 cal 1 horsepower = 550 ft-lb (wt)/sec = 745.578 int watt = 745.70 abs watt 1 in = (1/0.3937) = 2.54 cm 1 ft = 0.304800610 m 1 lb = 453.5924277 g 1 gal = 231 cu. in = 0.133680555 cu. ft = 3.785412 × 10−3 cu. m = 3.785412 liter
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sec = mean solar second Definition: g0 = standard gravity Definition: atm = standard atmosphere mm Hg (pressure) = standard millimeter mercury int = international; abs = absolute amp = ampere coul = coulomb
Absolute temperature of the ice point, 0°C PV product for ideal gas at 0°C R = gas constant per mole
ln = natural logarithm (base e) N = Avogadro number h = Planck constant c = velocity of light Constant in rotational partition function of gases Constant relating wave number and moment of inertia Z = constant relating wave number and energy per mole c2 = second radiation constant Ᏺ = Faraday constant
e = electronic charge
Constant relating wave number and energy per molecule k = Boltzmann constant Definition of IT cal: IT = International steam tables cal = thermochemical calorie Definition: cal = thermochemical calorie
Definition of Btu: Btu = IT British Thermal Unit
cal = thermochemical calorie Definition of horsepower (mechanical): lb (wt) = weight of 1 lb at standard gravity Definition of in: in = U.S. inch ft = U.S. foot (1 ft = 12 in) Definition; lb = avoirdupois pound Definition; gal = U.S. gallon
CONVERSION OF VALUES FROM U.S. CUSTOMARY UNITS TO SI UNITS American engineers are probably more familiar with the magnitude of physical entities in U.S. customary units than in SI units. Consequently, errors made in the conversion from one set of units to the other may go undetected. The following six examples will show how to convert the elements in six dimensionless groups. Proper conversions will result in the same numerical value for the dimensionless number. The dimensionless numbers used as examples are the Reynolds, Prandtl, Nusselt, Grashof, Schmidt, and Archimedes numbers. Table 1-7 provides a number of useful conversion factors. To make a conversion of an element in U.S. customary units to SI units, one multiplies the value of the U.S. customary unit, found on the left side in the table, by the equivalent value on the right side. For example, to convert 10 British thermal units to joules, one multiplies 10 by 1054.4 to obtain 10544 joules. In each example, the initial values of the factors are expressed in U.S. customary units, and the dimensionless value is calculated. Then the factors are converted to SI units, and the dimensionless value is recalculated. The two dimensionless values will be approximately the same. (Small variations occur due to the number of significant figures carried in the solution.)
Example 1. Calculation of a Reynolds Number DVρ NRe = µ
U.S. customary units D = 3 in. = 3⁄12 ft V = 6 ft/s ρ = 0.08 lbm/ft3 µ = 0.015 cp = (0.015)(0.000672) lbm/ft⋅s
(3/12)(6)(0.08) NRe = = 11,904 (0.015)(0.000672) SI units D = (3)(0.0254) m V = (6)(0.3048) m/s ρ = (0.08)(16.018) kg/m3 µ = (0.015)(0.001) kg/m⋅s
(Difference due to rounding)
Example 4. Calculation of a Grashof Number NGr = L3ρ2gβ(∆T)/µ2 U.S. Customary units L = 3 ft ρ = 0.0725 lbm/ft3 g = 32.174 ft/s2 β = 0.00168/°R ∆T = 99 °R µ = 0.019 centipoise = 0.019 × 0.000672 lbm/ft⋅s = 1.277 × 10−5 lbm/ft⋅s (33) (0.0725)2(32.174) (0.00168) (99) = 4.66 × 109 NGr = (1.277 × 10−5)2 SI units L = (3)(0.3048) = 0.9144 m ρ = (0.0725)(16.018) = 1.1613 kg/m3 g = 9.807 m/s2 β = (0.00168)/(1.8) = 0.000933/°K ∆T = (99)(1.8) = 178.2 °K µ = (0.019)(0.001) = 1.9 × 10−5 kg/m⋅s (0.9144)3(1.1613)2(9.807)(0.000933)(178.2) = 4.66 × 109 NGr = (1.9 × 10−5)2
Example 5. Calculation of a Schmidt Number µ NSc = ρD
(3 × 0.0254) (6 × 0.3048) (0.08 × 16.018) NRe = = 11,904 (0.015) (0.001)
Example 2. Calculation of a Prandtl Number Cp µ NPr = k U.S. customary units γp = 0.47 Btu/lbm °F µ = 15 centipoise = (15) (0.000672) (3600) lbm/ft⋅hr k = 0.065 Btu/hr⋅ft2 (°F/ft) (0.47) (15 × 0.000672 × 3600) NPr = = 262.4 0.065 SI units γ = (0.47)(4184) J/kg °C µ = (15)(0.001) kg/m⋅s k = (0.065)(1.728) J/s⋅m2 (°C/m) (0.47) (4184) (15) (0.001) NPr = = 262.6 (0.065) (1.728) (Difference due to rounding)
Example 3. Calculation of a Nusselt Number hD NNu = k U.S. customary units h = 200 Btu/hr⋅ft2⋅°F D = 1.5 in. = 1.5/12 ft k = 0.07 Btu/hr⋅ft2 (°F/ft) (200)(1.5/12) NNu = = 357.1 0.07 SI units h = (200)(5.678) J/(s⋅m2⋅°C) D = (1.5)(0.0254) m k = (0.07)(1.728) J/s⋅m2 (°C/m)
(200) (5.678) (1.5) (0.0254) NNu = = 357.7 (0.07) (1.728)
U.S. customary units µ = 0.02 centipoise = (0.02)(2.42) lbm/ft⋅hr ρ = 0.08 lbm/ft3 D = 1.0 ft2/hr (diffusivity) (0.02) (2.42) NSc = = 0.605 (0.08)(1.0) SI units µ = (0.02)(0.001) kg/m⋅s ρ = (0.08)(16.02) kg/m2 D = (1.0)(2.58 × 10−5) m2/s (0.02) (0.001) = 0.605 NSc = (0.08)(16.02)(1.0) (2.58 × 10−5)
Example 6. Calculation of an Archimedes Number d 3ρf(ρp − ρf)g NAr = µ2 U.S. customary units d = 2 mm = 2/[(1000)(0.3048)] = 0.00656 ft ρf = 0.0175 lbm/ft3 ρp = 168.5 lbm/ft3 g = 32.174 ft/s2 µ = 0.04 centipoise = 0.04 × 0.000672 = 2.688−5 lbm/ft⋅s (0.00656)3 (0.0175) (168.5 − 0.017) (32.174) = 37,064 NAr = (2.688 × 10−5)2 SI units d = 2/1000 m ρp = 168.5 × 16.02 = 2699.37 kg/m3 ρf = 0.0175 × 16.02 = 0.2804 g/m3 g = 9.807 m/s2 µ = 0.04 × 0.001 = 4 × 10−5 kg/m⋅s (2/1000)3 (0.2804) (2699.37 − 0.28) (9.807) = 37,118 NAr = (4 × 10−5)2 (Difference due to rounding)
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