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New Equation of State Constraints in the Critical Region



Ian Bell, Eric W. Lemmon


In this work, two classes of defects with multiparameter equations of state are investigated. In the first, it is shown that the critical point provided by equation of state developers often does not exactly meet the criticality conditions based on the first two density derivatives of the pressure being zero at the critical point. Based on the more accurate locations of the critical points given in the first part, the scaling of the densities along the binodal and spinodal in the critical region are investigated, and we find that the vast majority of equations have reasonable behavior but a few do not.
International Journal of Thermophysics


EOS, constraints, critical region


Bell, I. and Lemmon, E. (2023), New Equation of State Constraints in the Critical Region, International Journal of Thermophysics, [online], (Accessed February 26, 2024)
Created October 17, 2023, Updated December 1, 2023