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Clausius inequality correct for negative temperature

  1. Feb 26, 2013 #1
    is clausius inequality correct for negative temperature?, if you see the proof of it in positive temperature its not correct.
  2. jcsd
  3. Feb 27, 2013 #2
    Clausius statement is just a statement of second law of thermodynamics.

    Its correct.

    For reversible process,


    For irreversible process:


    And scientists are not able to achieve exactly zero absolute temperatures. Negative absolute temperature is not even defined !!
  4. Feb 27, 2013 #3


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    sankalpmittal, negative temperatures have long been introduced, especially in spin systems and lasers, and some month ago even for translational degrees of freedom.
    There is indeed some need to adapt the various statements of the second law when systems with negative temperature are present.
    See, e.g. this old article from scientific american:
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