1 J = 1 N · m = 1 kg · m2/s2
1 kg · m2/s2 = 1 J (joule) = 107 g · cm2/s2 (erg)
1 btu = 1055.06 J = 1.05506 kJ
1 btu = 252.16 cal (thermochemical)
1 kcal (thermochemical) = 1000 cal = 4.1840 kJ
1 cal (thermochemical) = 4.1840 J
1 cal (IT) = 4.1868 J
1 btu = 251.996 cal (IT)
1 btu = 778.17 ft · lbf
1 hp · h = 0.7457 kW · h
1 hp · h = 2544.5 btu
1 ft · lbf = 1.35582 J
1 ft · lbf/lbm = 2.9890 J/kg
44.222.225.12