Liquidus and Gaseous Line in Phase Diagram

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This paper describes that negative pair-interaction energy averaged over all particles and its density dependence gives van der Waals' equation of state through mean-field modeling and that liquidus and gaseous line for vapor-liquid phase are rigorously calculated from the equation of state, so that latent heat of vaporization and vapor pressure are obtained. Phase diagram is constructed from these lines and it is shown that the critical temperature depends not only on the size of molecule and the averaged magnitude of interaction energy but also on the mass of molecule. As a property of such system Kamerlingh-Onnes' constant is obtained.

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