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Adiabatic Irreversible Process

  1. Oct 22, 2016 #1
    Why does there tend to be disagreement on an irreversible adiabat entropy determination? Doesn't an irreversible adiabatic expansion increase the entropy of a system by the Clausius inequality?
  2. jcsd
  3. Oct 23, 2016 #2
    Total entropy of an isolated system or of Universe increases when the isolated system or universe undergoes irreversible adiabatic process.
  4. Oct 23, 2016 #3
    That's what I've thought. It can be proved by determining entropy through a reversible cycle. However, in class, it was mentioned on an assignment that the delta S is negative and not spontaneous. Which again, does not make sense
  5. Oct 23, 2016 #4
    I do not understand what is meant by spontaneous but for any process the change in entropy of a system can be negative but then the change in entropy of environment will be positive and greater in magnitude of the change for system, for an irreversible process.
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