The integral equation theory is nowadays one of the most widely used approaches for prediction of thermodynamic behaviour of homogeneous liquid system based on Ornstein–Zernike equation together with Closure relation. For improvement of correlation functions these closure properties are replaced by bridge function expansion. In this paper, the bridge function is first calculated from soft sphere mean spherical model approximation (SMSA) theory. Then, for systematic study of phase behavior of L-J fluid, the thermodynamic properties of interest like isothermal compressibility and chemical potential are derived from state of equations based on integral equation theory.
Bridge function Lennard-Jones Potential Isothermal compressibility Chemical potential
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