pound-mass (lbm) ... 2000 lbm length meter (m). 1 m = 3.28 ft foot(ft). 1 ft = 0.305 m. 1 km = 1000 m ... 1 lbf ft/lbm = 0.617 J/kg 1 Btu/lbm = 2.326 kJ/kg.
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