## Third Law of Thermodynamics

### Conversion Factors

DIMENSION SI/ENGLISH
Acceleration 1 m/s2 = 3.2808 ft/s2
Area 1 m2 = 1550 in2 = 10.764 ft2
Density 1 g/cm3 = 64.428 lb m/ft3 = 0.036127 lb m/in3
1lb m/in3 = 1728 lb m/ft3
Energy, heat, work 1 kJ = 0.94783 Btu
1 Btu = 1.05505 kJ
=5.4039 psia X ft3
1 Btu/lb m = 25,037 ft2/s2 = 2.326 kJ/kg.
1 kJ/kg = 0.430 Btu/lb m
1 kWh = 3412.2 Btu
Force 1 lbf = 32.174 lb m X ft/s2
1 N = 0.22481 lbf
Length 1 m = 39.370 in = 3.2808 ft = 1.0936 yd
1 ft = 12 in = 0.304800 m
1 mile = 5280 ft = 1.6093 km
Mass 1 kg = 2.2046226 lb m
1 lb m = 0.45359237
1 slug = 32.174 lb m = 14.5939 kg
1 short ton = 2000 lb m
Power 1 kW = 3412.2 Btu/h
=0.73756 lbf X ft/s
1 hp = 550 lbf X st/s = 0.7068 Btu/s
= 42.41 Btu/min = 2544.5 Btu/h
0.74750 kW
Pressure 1 Pa = 1.4504 X 10-4 psia
= 0.020886 lbf/ft2
1 psia = 144 lbf/ft2
1 atm= 14.696 psia
= 29.92 in Hg at 32 °F
Specific Heat 1 Btu/(lb m X °F) = 4.1868 kJ/(kg X °C)
1 kJ/(kg X °C) = 0.23885 Btu/(lb m X °F)
= 0.23885 Btu/(lb m X R)
Specific Volume 1 m3/kg = 16.02 ft3/lb m
Temperature T(R) = T (°F) + 459.67
T(°F) = 1.8 T(°C) + 32
T(°F) = T(K)
= 1.8 T(K)
Velocity 1 m/s = 3.2808 ft/s
= 2.237 mi/h
1 mi/h = 1.609 km/h
Volume 1 m3 = 6.1022 X 104in3 = 35.313 ft3
= 264.17 gal(U.S.A. only.)
1 U.S. gallon = 231 in3 = 3.7853 L