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Entropy in an isobar transformation

  1. Jul 13, 2012 #1
    What is the variation of entropy in an isobar transformation?
  2. jcsd
  3. Jul 13, 2012 #2

    Andrew Mason

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    Are we dealing with an ideal gas? If so, we can work it out from: TdS = dU + PdV

    If P is constant then:

    [itex]\Delta S = \int \frac{dU}{T} + P\int \frac{dV}{T}[/itex]

    If this is an ideal gas where PV = nRT, then we can substitute nRT/V for P (or nRdT/P for dV) and nCvdT for dU. Can you work that out?

  4. Jul 13, 2012 #3
    Yes, it's just so!
    Thank you very much! :)
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