1 lbm/in3 = 1728 Ibm/ft3. 1 kg/m3 = 0.062428 Ibm/ft3. 1 kJ = 0.94782 Btu. 1 Btu = 1.055056 kJ. = 5.40395 psia.ft3 = 778.169 lbf.ft.
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