Liquid-gas phase transtion to first order of an argon like fluid modeled by Sutherland potential

In this paper, an argon-like canonical system is studied. We introduce five hypothesis to deal with the total potential of the system. Then the balanced liquid-gas coexistence phenomenon is analyzed. Good equations of state and phase diagram are given. Some of our results is better and more brief than Mayor's Cluster Expansion.Comment: 13 pages, 4 figures, 2 table

An Extension of the Van der Waals Equation of State

We extend the Van der Waals equation of state to a universal form and find that the van der Waals equation of state is a special condition of this form. Then a good form of the equation of state for a balanced liquid-gas coexistence canonical argon-like system is given. The localization of this universal form concludes the paper.Comment: 8 pages, 2 figures, 2 table