1 J = 0,737 562 lbf-ft. 1 cal (Int.) = 4,186 81 J. 1 erg = 1,0 x 10-71. 1 eV = 1,602 177 33 x 10-19 J. Energia específica (e, u). 1 kJ/kg = 0,429 92 Btu/lbm.
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