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Boltzmann distribution - Derive equation of state of a gas from Helmholtz free energy

  1. Mar 15, 2011 #1
    1. The problem statement, all variables and given/known data

    Show that the equation of state of an ideal gas with N molecules in a container of volume V at temperature T is P=NkT. Use the result derived earlier.

    The result is A=-NkTlnZ, where Z is the partition function and A is the Helmholtz free energy.

    2. Relevant equations

    3. The attempt at a solution

    P=-([tex]\delta[/tex]A)/([tex]\delta[/tex]V)T

    P=NkT([tex]\delta[/tex]lnZ)/([tex]\delta[/tex]V)T

    Here, I'm stuck. Surely, ([tex]\delta[/tex]lnZ)/([tex]\delta[/tex]V)T=0?

    It seems so trivial. I don't understand what I'm missing. Thank you in advance.
     
  2. jcsd
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