The Virial EOS

The Virial EOS is
based on the Ideal Gas EOS:
Defining equation for the compressibiity factor, Z
Since Z is not always equal to 1, the Ideal Gas EOS is expanded as an infinite power series in terms of 1/Molar volume :
Virial equation of state
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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Ch 2, Lesson F, Page 2 - The Virial EOS