The Critical Constants of Polar Gases

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Abstract
The range of usefulness of the virial expansion is discussed. It is shown that this expansion closely resembles the Beattie-Bridgman equation if terms up to the third virial coefficient are included. This suggests that the ranges of validity of the two equations may be similar—namely, almost up to the critical density. The virial expansion is therefore used to calculate the critical constants of both nonpolar and polar gases. These constants are much less sensitive to the dipole-energy than are the virial coefficients. The agreement with experiment is satisfactory.

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