1 g/cm3 = 1 kg/L = 1000 kg/m3. Energy, heat, work, ... 1 g/cm3 = 62.428 Ibm/ft3 = 0.036127 Ibm/in3 ... 1 Btu/lbm = 25,037 ft2/s2 = 2.326* kJ/kg.
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