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Homework Help: Are these two equations for adiabatic processes the same

  1. Sep 28, 2011 #1

    I was just wondering about this because is most texts I've seen this one:

    Tf/Ti = (Vi/Vf)^y - 1

    y= gamma (Cp/CV)

    However, in my worksheets I always see this one:

    Tf/Ti = (Vf/Vi)^1 -y

    And actually, when I tried to solve one problem, I tried to use the first one but the result wasn't the same...
  2. jcsd
  3. Sep 29, 2011 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    The two expressions are equivalent:

    [tex]x^y = x^{({-1}*{-y})} = (1/x)^{-y}[/tex]

    So I suggest that you go back and check your math again. The result has to be the same.

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