This paper researched the internal energy, Molar heat capacity and critical parameter of Clausius gas, analyzed the difference between Clausius gas and van der Waals gas.

对克劳修斯气体的内能、摩尔热容量、临界参量作了研究，分析了该气体与范得瓦尔斯气体的差异。

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By further analyzing each energy item, it could be obtained that van der Waals' interaction energy was the main driving force for complex.

进一步分析各个能量项可得，范德华相互作用能为包结的主要驱动力。

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