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Does entropy in a closed system always increase OR remain constant (

  1. Nov 4, 2012 #1
    Does entropy in a closed system always increase OR remain constant ( in equilibrium ).

    I have a friend arguing it is ALWAYS increasing.

    His latest argument was, "if no energy enters or leaves an isolated system, the availability of the remaining energy decreases."
     
  2. jcsd
  3. Nov 4, 2012 #2
    Re: Entropy

    Once the closed system reaches its final equilibrium state , the entropy remains constant. The entropy of a system is a function of several macroscopic quantitates ( Energy, Volume, Number of particles ). Once all this remains constant ( Like a gas in a box which is uniformally distributed in it) how could the entropy change?
     
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