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Internal/external energy in compressor

  1. Dec 9, 2008 #1
    This is about how to relate an abstraction of thermodynamics to a real compressor. The difference of the specific heats is called "external work" since in the legendary cylinder holding a pound of air being heated one degree, the spec heat capacity at constant pressure is this much more than the internal energy due to the piston having to push away the atmosphere to move and let the air inside expand.

    My question is, how does this relate to a real compressor, and isn't it true that the term "external work" as in "The gas engine did the external work of running the generator," is a different usage of the same words?

  2. jcsd
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