Abstract
This article presents an attempt to consider the problem of the statistical-mechanic foundation of the equation of state of fluids within the framework of the generalized approach. A variant of the thermodynamic perturbation theory based on scaling transformation of the partition function has been applied to the functional expansion of the free energy. The various modifications of the equation of state have been obtained for a number of simple model potentials on the basis of the free energy functional series at a certain choice of small expansion parameters.
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