On Lattice Theories of the Liquid State

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Abstract
The Lennard‐Jones and Devonshire theory of the liquid state has been modified by introduction of the quasi‐chemical method to allow for both holes in the liquid and an expandable lattice. The essential step is to minimize the free energy with respect to a lattice expansion parameter. On the whole, critical constants obtained in this way are in appreciably better agreement with experiment than those of the Lennard‐Jones and Devonshire theory. however, the equilibrium number of holes turns out to be much too small.

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