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Virial Expansion, Van Der Waals Gas

  1. Apr 12, 2014 #1
    1. The problem statement, all variables and given/known data

    Taken from 'Concepts in Thermal Physics':

    14w4kli.png

    2. Relevant equations



    3. The attempt at a solution

    For the step highlighted in red, why does the '-1' go into the integrand?
     
  2. jcsd
  3. Apr 13, 2014 #2
    1 integrated over the space gives the volume of the space. Divide that by the factor 1/V^N outside the integral and you get minus one. Hence cancelling the plus one outside the integral.
     
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