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Modelling helium in the joule kelvin expansion

  1. Dec 17, 2009 #1
    How is it best to model Helium gas,

    Ideal gas equation?


    Van der Waals?

    some other equation?

    Also if it is dieterici or van der waals,what the values of a and b, the constants in the equation of state.
  2. jcsd
  3. Dec 17, 2009 #2


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    Homework Helper

    It depends on what temperature/pressure the helium is at and how accurate you want your model to be. For helium at atmospheric temperature and pressure, the ideal gas model is already extremely accurate.
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