Density, 1 slug/ft 3 = 1 lbf s 2 /ft 4, 515.38 kg/m3. 1 lbf s 2 /in 4, 10.687 × 10 6 kg/m3. Energy, 1 ft lbf, 1.3558 J (N m). Force, 1 lbf, 4.4482 N (kg m/s 2 ).
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