1-1c

1–1C What is the difference between the classical and the
statistical approaches to thermodynamics?
ANS
1-4CPound-mass lbmisthe mass unitinEnglish systemwhereas pound-force lbf is the force unit.  One
pound-force is the force required to accelerate a mass of 32.174 lbmby 1 ft/s 2. In other words, the weight ofa 1-lbmmass at sea level is 1lbf.