Abstract
In the present work the existence of a common intersection point for the isobars of internal pressure of some liquids of interest as a function of temperature has been investigated, experimentally and theoretically. The regularity has been tested for molten alkali metals and some pure liquids. The common intersection point occurs at approximately 0.57–0.62 of the critical temperature of these liquids. We have found that the linear isotherm regularity (LIR), Ihm–Song–Mason (ISM) and Peng–Robinson (PR) equations of state are able to predict the common internal pressure point. An important result obtained from this research is that we may get information about the magnitude of the separation at the minimum of the average effective potential well, r m, using the density of the common intersection point, ρ oi.
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