On the extended principle of corresponding states and the pair interaction potential

Direct inversion methods are used to analyze the extended principle of corresponding states of Kestin and co-workers in terms of the pair interaction potential. It is shown how reference to the potential makes possible a number of extensions and improvements to the corresponding-states correlations. Specifically, the range of validity of the principle is made more precise, the consistency between gas viscosities and second virial coefficients is checked, and it is shown how to improve the available temperature range over which predictions can be made and the precision with which properties can be predicted.