The key to calculate the specific enthalpy and enthalpy difference is to make sure of the benchmark as well as the value of heat capacity value.

比焓和焓差的计算关键是计算基准的确定，同时也离不开热容值的正确获取。

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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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for instance, for the thermos with the coffee in if you place the boundary in the inside wall of the glass or the outside wall of the glass and the inside of the thermos, that makes a difference; different heat capacity, etcetera.

比如说，对于装咖啡的热水瓶来说,你把边界设置在瓶胆的内壁上,或者设置在瓶胆外壁上,或设在热水瓶里面，情况都是不一样的;,有不同的热容等等。

麻省理工公开课 - 热力学与动力学课程节选