Page 469 - Schaum's Outline of Theory and Problems of Applied Physics

454 CONVERSION FACTORS [APP. B

1 slug = 14.6kg
(Note: 1 slug corresponds to 32.2 lb in the sense that the weight
of 1 slug at the earth’s surface is 32.2 lb.)
1 atomic mass unit (u) = 1.66 × 10 −27 kg = 1.49 × 10 −10 J = 931 MeV

Force
1 newton (N) = 0.225 lb = 3.60 oz
1 pound (lb) = 16 ounces (oz) = 4.45 N
(Note: 1 lb corresponds to 0.454 kg = 454 g in the sense that the mass
of something that weighs 1 lb at the earth’s surface is 0.454 kg.)

Pressure
2
2
1Pa = 1 N/m = 2.09 × 10 −2 lb/ft = 1.45 × 10 −4 lb/in. 2
3
2
2
1 lb/in. = 144 lb/ft = 6.90 × 10 Pa
5
1 atm = 1.013 × 10 Pa = 14.7 lb/in. 2
Energy
18
1 joule (J) = 0.738 ft·lb = 2.39 × 10 −4 kcal = 6.24 × 10 eV
1 foot-pound (ft·lb) = 1.36 J = 1.29 × 10 −3 Btu = 3.25 × 10 −4 kcal
1 kilocalorie (kcal) = 4185 J = 3.97 Btu = 3077 ft·lb
1 Btu = 0.252 kcal = 788 ft·lb
1 electronvolt (eV) = 10 −6 MeV = 10 −9 GeV = 1.60 × 10 −19 J
Power
1 watt (W) = 1 J/s = 0.738 ft·lb/s
3
1 kilowatt (kW) = 10 W = 1.34 hp
1 horsepower (hp) = 550 ft·lb/s = 746 W
1 refrigeration ton = 12,000 Btu/h

Temperature
T C = 5/9(T F − 32 )
◦
T F = 9/5(T C + 32 )
◦
T K = T C + 273 ◦
T R = T F + 460 ◦