第三、第四章在理想气体的基础上，得出了实际气体状态方程及其多变过程中热力学计算。
In chapter three and four, we give some state equations of real gas and the thermodynamical analysis in polytropic process based on the theory of ideal gas.
在热力学中状态方程的概念被突出地使用。
In thermodynamics the equations of state are prominently used.
油藏流体状态方程研究具有重要的理论和现实意义，它将成为流体热力学研究的一个新的生长点。
To study the state equation of reservoir fluid is of theoretic and realistic significance. It will become a new growing point in research on fluid thermodynamics.
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