High-Temperature Equation of State by a Perturbation Method. II. Polar Gases

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Abstract
The perturbation theory described in a previous article is applied to the calculation of the equation of state at high temperature of a polar gas. The electrostatic dipolar potential is considered to be a perturbation on the nonpolar Lennard‐Jones potential. The dipole contribution to the equation of state is expressed in terms of properties of the unperturbed system. These properties are obtained from experimental data on argon and xenon. Numerical tables of the reduced equation of state of the polar gas, over a wide temperature and density range, are presented. The theory is tested on water vapor and on methyl fluoride. Theoretical predictions of the pressure agree with experimental data over a wide density range (up to 0.25 g/cc for water) to within several percent.