Key points are not available for this paper at this time.
The equations for the thermodynamic functions of an imperfect gas up to and including the pressure of condensation, are calculated for a one-component system consisting of chemically saturated molecules. The method starts with the calculation of the phase volume available to a system below a given energy. The thermodynamic functions are expressed in terms of integrals over the configuration space of a few molecules, the integrands involving the mutual potentials. The equations derived are formally equivalent to those derived in the previous papers of this series, using the Gibbs method.
Streeter et al. (Wed,) studied this question.