英制单位转换国际单位

This table gives conversion factors to convert various units to their SI equivalents. It will not be very useful for people who prefer to use cgs or English units although it can be used to convert from SI to those systems.

Name To convert from to multiply by divide by

Acceleration ft/sec^2 m/s^2 0.3048 3.2810

Area acre m^2 4047 2.471E-04

Area ft^2 m^2 9.294E-02 10.7600

Area hectare m^2 1.000E+04 1.000E-04

Area in^2 m^2 6.452E-04 1550

Density g/cm^3 kg/m^3 1000 1.000E-03

Density lbm/ft^3 kg/m^3 16.02 6.243E-02

Density lbm/in^3 kg/m^3 2.767E+04 3.614E-05

Density lb s^2/in^4 kg/m^3 1.069E+07 9.357E-08

Density slug/ft^3 kg/m^3 515.40 1.940E-03

Energy BTU J 1055 9.478E-04

Energy cal J 4.1859 0.2389

Energy erg J 1.000E-07 1.000E+07

Energy ev J 1.602E-19 6.242E+18

Energy ft lbf J 1.3557 0.7376

Energy kiloton TNT J 4.187E+12 2.388E-13

Energy kW hr J 3.600E+06 2.778E-07

Energy megaton TNT J 4.187E+15 2.388E-16

Force dyne N 1.000E-05 1.000E+05

Force lbf N 4.4484 0.2248

Force ozf N 0.2780 3.5968

Heat capacity BTU/lbm F J/kg C 4188 2.388E-04

Heat transfer coefficient BTU/hr ft^2 F W/m^2 C 5.6786 0.1761

Length AU m 1.496E+11 6.685E-12

Length ft m 0.3048 3.2810

Length in m 2.540E-02 39.3700

Length mile m 1609 6.214E-04

Length Nautical mile m 1853 5.397E-04

Length parsec m 3.085E+16 3.241E-17

Mass amu kg 1.661E-27 6.022E+26

Mass lbm kg 0.4535 2.2050

Mass lb s^2/in kg 1200.00 5.711E-03

Mass slug kg 14.59 6.853E-02

Mass flow rate lbm/hr kg/s 1.260E-04 7937

Mass flow rate lbm/sec kg/s 0.4535 2.2050

Moment of inertia ft lb s^2 kg m^2 1.3557 0.7376

Moment of inertia in lb s^2 kg m^2 0.1130 8.8510

Moment of inertia oz in s^2 kg m^2 7.062E-03 141.60

Power BTU/hr W 0.2931 3.4120

Power hp W 745.71 1.341E-03

Power tons of refrigeration W 3516 2.844E-04

Pressure bar Pa 1.000E+05 1.000E-05

Pressure dyne/cm^2 Pa 0.1000 10.0000

Pressure in. mercury Pa 3377 2.961E-04

Pressure in. water Pa 248.82 4.019E-03

Pressure kgf/cm^2 Pa 9.807E+04 1.020E-05

Pressure lbf/ft^2 Pa 47.89 2.088E-02

Pressure lbf/in^2 Pa 6897 1.450E-04

Pressure mbar Pa 100.00 1.000E-02

Pressure microns mercury Pa 1.3332 0.7501

Pressure mm mercury Pa 1333 7.501E-04

Pressure std atm Pa 1.013E+05 9.869E-06

Specific heat BTU/lbm F J/kg C 4186 2.389E-04

Specific heat cal/g C J/kg C 4186 2.389E-04

Temperature F C 0.5556 1.8000

Thermal conductivity BTU/hr ft F W/m C 1.7307 0.5778

Thermal conductivity BTU in/hr ft^2 F W/m C 0.1442 6.9340

Thermal conductivity cal/cm s C W/m C 418.60 2.389E-03

Thermal conductivity cal/ft hr F W/m C 6.867E-03 145.62

Time day s 8.640E+04 1.157E-05

Time sidereal year s 3.156E+07 3.169E-08

Torque ft lbf N m 1.3557 0.7376

Torque in lbf N m 0.1130 8.8504

Torque in ozf N m 7.062E-03 141.61

Velocity ft/min m/s 5.079E-03 196.90

Velocity ft/s m/s 0.3048 3.2810

Velocity km/hr m/s 0.2778 3.6000

Velocity miles/hr m/s 0.4470 2.2370

Viscosity - absolute centipose N s/m^2 1.000E-03 1000

Viscosity - absolute g/cm s N s/m^2 0.1000 10

Viscosity - absolute lbf/ft^2 s N s/m^2 47.87 2.089E-02

Viscosity - absolute lbm/ft s N s/m^2 1.4881 0.6720

Viscosity - kinematic centistoke m^2/s 1.000E-06 1.000E+06

Viscosity - kinematic ft^2/sec m^2/s 9.294E-02 10.7600

Volume ft^3 m^3 2.831E-02 35.3200

Volume in^3 m^3 1.639E-05 6.102E+04

Volume liters m^3 1.000E-03 1000

Volume U.S. gallons m^3 3.785E-03 264.20

Volume flow rate ft^3/min m^3/s 4.719E-04 2119

Volume flow rate U.S. gallons/min m^3/s 6.309E-05 1.585E+04

Material constants

Back to contents

This table gives various material properties listed alphabetically. The units are SI.

Conductivity Acetyl 0.2300 W/m C

Conductivity Acrylic 0.1400 W/m C

Conductivity Aluminum 2024-T3 190.40 W/m C

Conductivity Aluminum 3003 0.4000 W/m C

Conductivity Aluminum 6061-T6 155.80 W/m C

Conductivity Aluminum 7079-T6 121.10 W/m C

Conductivity Beryllium QMV 147.10 W/m C

Conductivity Borosilicate glass 1.1300 W/m C

Conductivity Borosilicate glass (Tempax) 1.1300 W/m C

Conductivity Concrete (sand & gravel) 1.8000 W/m C

Conductivity Copper - pure 392.90 W/m C

Conductivity Diamond 550.00 W/m C

Conductivity Douglas fir 0.1100 W/m C

Conductivity Dow Corning 200 (350cSt) 0.1590 W/m C

Conductivity Dow Corning 739 0.1900 W/m C

Conductivity Dow Corning 93-500 0.1500 W/m C

Conductivity Dow Corning Q3-6605 0.8400 W/m C

Conductivity Epoxy (Epotek 353ND) 0.0490 W/m C

Conductivity Epoxy (Masterbond 11A0) 1.4400 W/m C

Conductivity Glass wool 0.0400 W/m C

Conductivity Gold - pure 297.70 W/m C

Conductivity Helium 2.7700 W/m C

Conductivity Ice 2.2000 W/m C

Conductivity Iron 83.50 W/m C

Conductivity Lead - pure 37.04 W/m C

Conductivity Limestone 0.5000 W/m C

Conductivity Magnesium HK31A-H24 114.20 W/m C

Conductivity Magnesium AZ31B-H24 95.19 W/m C

Conductivity Methane 0.3030 W/m C

Conductivity Molybdenum - wrought 143.60 W/m C

Conductivity Nickel - pure 91.73 W/m C

Conductivity Nitrogen 0.1460 W/m C

Conductivity Nylon 0.2400 W/m C

Conductivity Platinum 69.23 W/m C

Conductivity Polycarbonate 0.2000 W/m C

Conductivity Polypropylene 0.4000 W/m C

Conductivity Polystyrene foam 0.3600 W/m C

Conductivity Polyurethane foam 0.0260 W/m C

Conductivity PTFE 0.2400 W/m C

Conductivity Quartz 1.3200 W/m C

Conductivity SiC Alpha 77.50 W/m C

Conductivity SiC sintered KT 80.00 W/m C

Conductivity Silastic E 0.1800 W/m C

Conductivity Silastic L 0.2800 W/m C

Conductivity Silicone foam (Poron) 0.0600 W/m C

Conductivity Silver - pure 417.10 W/m C

Conductivity Snow (light) 0.6000 W/m C

Conductivity Snow (packed) 2.2000 W/m C

Conductivity Soil (coarse) 0.5200 W/m C

Conductivity Soil (dry w/stones) 0.5200 W/m C

Conductivity Soil (dry) 0.2300 W/m C

Conductivity Soil (w/42% water) 1.1000 W/m C

Conductivity Steel AISI 304 16.27 W/m C

Conductivity Steel AISI C1020 46.73 W/m C

Conductivity Tantalum 53.65 W/m C

Conductivity Titanium B 120VCA 7.4420 W/m C

Conductivity Tungsten 164.40 W/m C

Conductivity Water 0.6030 W/m C

Conductivity White pine 0.1100 W/m C

Density Acrylic 1400 kg/m^3

Density Air (2800 m) 0.9800 kg/m^3

Density Air (STP) 1.2930 kg/m^3

Density Aluminum 2024-T3 2770 kg/m^3

Density Aluminum 3003 2700 kg/m^3

Density Aluminum 6061-T6 2700 kg/m^3

Density Aluminum 7079-T6 2740 kg/m^3

Density Ammonia - liquid 682.10 kg/m^3

Density Argon - liquid 1390 kg/m^3

Density Beryllium QMV 1850 kg/m^3

Density Borosilicate Ohara E6 2180 kg/m^3

Density Borosilicate Tempax 2230 kg/m^3

Density Concrete 2242 kg/m^3

Density Copper - pure 8900 kg/m^3

Density Dow Corning 200 (350cSt) 968.00 kg/m^3

Density Fused silica 2200 kg/m^3

Density Glass wool 64.00 kg/m^3

Density Gold - pure 1.932E+04 kg/m^3

Density Helium - liquid 125.00 kg/m^3

Density Hydrogen - liquid 70.00 kg/m^3

Density Iron 7830 kg/m^3

Density Lead - pure 1.134E+04 kg/m^3

Density Magnesium AZ31B-H24 1770 kg/m^3

Density Magnesium HK31A-H24 1790 kg/m^3

Density Methane - liquid 424.00 kg/m^3

Density Molybdenum - wrought 1.030E+04 kg/m^3

Density Neon - liquid 1200 kg/m^3

Density Nickel - pure 8900 kg/m^3

Density Nitrogen - liquid 804.00 kg/m^3

Density Nylon 1700 kg/m^3

Density Platinum 2.145E+04 kg/m^3

Density Polycarbonate 1300 kg/m^3

Density Polyethylene 2300 kg/m^3

Density PTFE 1200 kg/m^3

Density SiC Alpha 2975 kg/m^3

Density SiC sintered KT 2975 kg/m^3

Density Silver - pure 1.050E+04 kg/m^3

Density Steel AISI 304 8030 kg/m^3

Density Steel AISI C1020 7850 kg/m^3

Density Tantalum 1.660E+04 kg/m^3

Density Titanium B 120VCA 4850 kg/m^3

Density Tungsten 1.930E+04 kg/m^3

Density Water (4 C) 999.97 kg/m^3

Density White pine 513.00 kg/m^3

Elastic modulus Aluminum 2024-T3 7.310E+10 Pa

Elastic modulus Aluminum 6061-T6 7.310E+10 Pa

Elastic modulus Aluminum 7079-T6 7.172E+10 Pa

Elastic modulus Beryllium QMV 2.897E+11 Pa

Elastic modulus Borosilicate Ohara E6 5.743E+10 Pa

Elastic modulus Borosilicate Tempax 6.200E+10 Pa

Elastic modulus Copper - pure 1.172E+11 Pa

Elastic modulus Gold - pure 7.448E+10 Pa

Elastic modulus Lead - pure 1.379E+10 Pa

Elastic modulus Magnesium AZ31B-H24 4.483E+10 Pa

Elastic modulus Magnesium HK31A-H24 4.414E+10 Pa

Elastic modulus Molybdenum - wrought 2.759E+11 Pa

Elastic modulus Nickel - pure 2.207E+11 Pa

Elastic modulus Platinum 1.469E+11 Pa

Elastic modulus SiC Alpha 4.760E+11 Pa

Elastic modulus SiC sintered KT 3.320E+11 Pa

Elastic modulus Silver - pure 7.241E+10 Pa

Elastic modulus Steel AISI 304 1.931E+11 Pa

Elastic modulus Steel AISI C1020 2.034E+11 Pa

Elastic modulus Tantalum 1.862E+11 Pa

Elastic modulus Titanium B 120VCA 1.021E+11 Pa

Elastic modulus Tungsten 3.448E+11 Pa

Electrical resistivity Aluminum 2017 4.000E-08 ohm m

Electrical resistivity Aluminum 3003 4.000E-08 ohm m

Electrical resistivity Aluminum 99.996% 2.655E-08 ohm m

Electrical resistivity Copper 1.673E-08 ohm m

Electrical resistivity Nickel ASTM B160 1.000E-07 ohm m

Electrical resistivity Steel AISI 304 7.200E-07 ohm m

Electrical resistivity Steel AISI C1020 1.000E-07 ohm m

Heat capacity Air 1006 J/kg C

Heat capacity Aluminum 2024-T3 963.00 J/kg C

Heat capacity Aluminum 6061-T6 963.00 J/kg C

Heat capacity Aluminum 7079-T6 963.00 J/kg C

Heat capacity Beryllium QMV 1884 J/kg C

Heat capacity Borosilicate glass 710.00 J/kg C

Heat capacity Concrete 1000 J/kg C

Heat capacity Copper - pure 385.00 J/kg C

Heat capacity Dow Corning 200 (350 cST) 1465 J/kg C

Heat capacity Ethanol (25 C) 2453 J/kg C

Heat capacity Gold - pure 130.00 J/kg C

Heat capacity Ice 2093 J/kg C

Heat capacity Iron 440.00 J/kg C

Heat capacity Lead - pure 130.00 J/kg C

Heat capacity Magnesium AZ31B-H24 1047 J/kg C

Heat capacity Magnesium HK31A-H24 544.00 J/kg C

Heat capacity Methanol (25 C) 2547 J/kg C

Heat capacity Molybdenum - wrought 293.00 J/kg C

Heat capacity Nickel - pure 461.00 J/kg C

Heat capacity Platinum 130.00 J/kg C

Heat capacity SiC Alpha 1300 J/kg C

Heat capacity SiC sintered KT 1340 J/kg C

Heat capacity Silica (0 C) 937.00 J/kg C

Heat capacity Silver - pure 235.00 J/kg C

Heat capacity Steel AISI 304 503.00 J/kg C

Heat capacity Steel AISI C1020 419.00 J/kg C

Heat capacity Tantalum 126.00 J/kg C

Heat capacity Titanium B 120VCA 544.00 J/kg C

Heat capacity Tungsten 138.00 J/kg C

Heat capacity Water 4216 J/kg C

Heat of combustion Methane 55.70 MJ/kg

Heat of combustion Octane 47.70 MJ/kg

Heat of fusion Nitrogen 25.50 kJ/kg

Heat of fusion Water 334.00 kJ/kg

Heat of vaporization Ammonia 1368 kJ/kg

Heat of vaporization Argon 162.76 kJ/kg

Heat of vaporization Helium 23.93 kJ/kg

Heat of vaporization Hydrogen 451.90 kJ/kg

Heat of vaporization Methane 577.40 kJ/kg

Heat of vaporization Neon 87.03 kJ/kg

Heat of vaporization Nitrogen 199.20 kJ/kg

Heat of vaporization Water (100 C) 2258 kJ/kg

Heat transfer coef. Air v = 0 m/s 5.6000 W/ C m^2

Heat transfer coef. Air v = 3.4 m/s 18.90 W/ C m^2

Heat transfer coef. Air v = 6.7 m/s 38.00 W/ C m^2

Kinematic viscosity Air (101 kPa) 1.800E-05 m^2/s

Kinematic viscosity Dow Corning 200 (350cSt) 1.121E-07 m^2/s

Kinematic viscosity Water (0 C) 1.753E-06 m^2/s

Poisson's ratio Aluminum 2024-T3 0.3300

Poisson's ratio Aluminum 6061-T6 0.3300

Poisson's ratio Aluminum 7079-&6 0.3300

Poisson's ratio Beryllium QMV 0.0300

Poisson's ratio Borosilicate Ohara E6 0.1950

Poisson's ratio Borosilicate Tempax 0.2200

Poisson's ratio Copper - pure

Poisson's ratio Gold - pure 0.4200

Poisson's ratio Lead - pure 0.4200

Poisson's ratio Magnesium AZ31B-H24 0.3500

Poisson's ratio Magnesium HK31A-H24 0.3500

Poisson's ratio Molybdenum - wrought 0.3200

Poisson's ratio Nickel - pure

Poisson's ratio Platinum 0.3900

Poisson's ratio Silver - pure 0.3700

Poisson's ratio Steel AISI 304 0.2900

Poisson's ratio Steel AISI C1020 0.2900

Poisson's ratio Tantalum 0.3500

Poisson's ratio Titanium B 120VCA 0.3000

Poisson's ratio Tungsten 0.2800

Thermal expansion coefficient Aluminum 2024-T3 22.68 microns/m C

Thermal expansion coefficient Aluminum 6061-T6 24.30 microns/m C

Thermal expansion coefficient Aluminum 7079-T6 24.66 microns/m C

Thermal expansion coefficient Beryllium QMV 14.94 microns/m C

Thermal expansion coefficient Borosilicate E6 -30 to +70C 2.8000 microns/m C

Thermal expansion coefficient Copper - pure 16.56 microns/m C

Thermal expansion coefficient Gold - pure 4.39 microns/m C

Thermal expansion coefficient Lead - pure 52.74 microns/m C

Thermal expansion coefficient Magnesium AZ31V-H24 26.10 microns/m C

Thermal expansion coefficient Magnesium HK31A-H24 25.20 microns/m C

Thermal expansion coefficient Molybvdenum - wrought 5.4000 microns/m C

Thermal expansion coefficient Nickel - pure 12.96 microns/m C

Thermal expansion coefficient Platinum 9.0000 microns/m C

Thermal expansion coefficient SiC Alpha 4.0000 microns/m C

Thermal expansion coefficient SiC sintered KT 5.0000 microns/m C

Thermal expansion coefficient Silver - pure 19.80 microns/m C

Thermal expansion coefficient Steel AISI 304 17.82 microns/m C

Thermal expansion coefficient Steel AISI C1020 11.34 microns/m C

Thermal expansion coefficient Tantalum 6.4800 microns/m C

Thermal expansion coefficient Titanium B 120VCA 9.3600 microns/m C

Thermal expansion coefficient Tungsten 4.5000 microns/m C

Viscosity Air (0 C,101 kPa) 1.708E-05 N s/m^2

Viscosity Carbon dioxide (0 C,101 kPa) 1.390E-05 N s/m^2

Viscosity Helium (0 C,101 kPa) 1.860E-05 N s/m^2

Viscosity Hydrogen (0 C,101 kPa) 8.345E-06 N s/m^2

Viscosity Methane (0 C,101 kPa) 1.026E-05 N s/m^2

Viscosity Nitrogen (0 C,101 kPa) 1.660E-05 N s/m^2

Viscosity Oxygen (0 C,101 kPa) 1.919E-05 N s/m^2

Viscosity Benzene (0 C) 9.121E-04 N s/m^2

Viscosity Carbon tetrachloride (0 C) 1.346E-03 N s/m^2

Viscosity Glycerin (0 C) 12.07 N s/m^2

Viscosity Kerosene (0 C) 2.959E-03 N s/m^2

Viscosity Mercury (0 C) 1.685E-03 N s/m^2

Viscosity Oil - light machine (0 C) 0.3534 N s/m^2

Viscosity Water (0 C) 1.753E-03 N s/m^2

Date created: 9/26/95

Last modified: 04/05/98

Copyright © 1995, 1996, 1997, 1998 Walter A. Siegmund

Walter A. Siegmund