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. 
Jianxiang Tian, Yuanxing Gui