| Density |
| 1 lb/in3 = 27.68 g/cm3 |
| 1 lb/ft3 = 16.02 kg/m3 |
| 1 lb/gallon = 99.78 kg/m3 |
| 1 ton/yd3 = 1.329 t/m3 |
| |
| Moments of mass |
| 1 lb ft = 0.1383 kg m |
| 1 lb ft2 = 421.4 kg cm2 |
| |
| Force |
| 1 lb force (lbf) = 4.448 N (standard gravity) |
| 1 ponundal (pdl) = 421.4 kg cm2 |
| 1 ton force = 9.964 kN |
| |
| Pressure (or stress) |
| 1 lb/ft2 = 47.88 N/m2 |
| 1 lb/in2 (psi) = 6.895 kN/m2 (kPa) |
| 1 ton/ft2 = 107.3 kN/m2 |
| 1 ton/in2 = 15.44 N/mm2 |
| 1 in Hg (0 deg C) = 3.386 kN/m2 (kPa) = 0.491 psi |
| 1 ft H2O (4 deg C) = 2.989 kN/m2 = 0.434 psi |
| 1 atmosphere (atm) = 1.013 bar |
| |
| Energy, etc. |
| 1 ft lbf = 1.356 J |
| 1 ft pdl = 42.14 mJ |
| 1 horse power = 745.7 W = 550 ft lbf/s |
| 1 electron volt (eV) = 1.602 E-19 J |
| 1 degree Fahrenheit = 5/9 K |
| * 1 calorie = 4.187 J |
| * 1 Btu = 1.055 kJ = 252 cal |
| 1 Chu = 1.899 kJ = 9/5 Btu |
| 1 therm = 105.5 MJ = E-05 Btu |
| 1 Btu/hour = 0.293 W |
| 1 Btu/lb = 2.325 kJ/kg |
| * The calorie and Btu were defined in terms of heating
water, and their precise values depended on the temperature limits specified. The figures
given are based on agreed international equivalents. |