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VOLUME 62 (1995) | ISSUE 7 | PAGE 557
Thermodynamic model of a liquid
In this model the thermal vibrations of atoms with respect to their positions of equilibrium are described in a modified Debye approximation which at high temperatures and low densities changes to the description of an ideal gas. The elastic (cold) component of the free energy differs from that of a solid by lower values of the density and heat vaporization at zero temperatures. A configurational component, which is peculiar to a liquid and which characterizes the degree of disorder in the liquid, is introduced. The thermodynamics of neon is studied, isotherms of the free energy and pressure are constructed, and solid-liquid, solid-gas, and liquid-gas phase transitions are described.