Equation of State for Substances that Satisfy the Corresponding States Law

Universal expressions for the free energy of substances that satisfy the law of corresponding states are obtained. The equation of state is constructed using an iInterpolation between the high temperature Debye approximation and the ideal-gas one. Missing data needed for calculations have been found from the comparison of calculated and tabulated values of entropy and pressure along the phase coexistence curves. The thermodynamics of corresponding states, constructed in this way, allows one to find the triple- and criticalpoint parameters, as well as the phase coexistence curves with an accuracy that does not exceed the accuracy of the law of corresponding states itself.