Modelling helium in the joule kelvin expansion

sheelbe999
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How is it best to model Helium gas,

Ideal gas equation?

Dieterici?

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.
 
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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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