Abstract

An extended corresponding-states model is developed that is capable of correlating and predicting the third virial coefficients for a wide range of substances. The present method only requires substance-dependent parameters, such as the critical temperature, critical volume, acentric factor, and aspherical factor, which are based on the simple extended corresponding-states principle. Comparisons with experimental data and existing models show that the present model is more general in that it not only is equivalent to the existing method for nonpolar gases, but also can represent the third virial coefficients of polar substances.

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