# The Virial EOS

The Virial EOS is

based on the Ideal Gas EOS:

based on the Ideal Gas EOS:

Since Z is not always equal to 1, the Ideal Gas EOS is expanded as an infinite power series in terms of 1/ :

The Virial Equation of State !

B, C, D, E and so on are the Virial Coefficients.

Virial Coefficients :

- Are functions of temperature only
- Can be determined experimentally
- Can also be determined theoretically for simple molecules using the principles of statistical mechanics.

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