一、问题的提出 实际气体的性质可以通过实际气体各状态函数对“同温”、“同压”下理想气体各相应状态函数的偏差(即所谓余函数)表示出来.这些余函数均可通过对相应函数的微分方程结合实际气体状态方程从极低压力(P_0)沿定温线积分而得出.然而,在实际应用这些积分式进行计算时,会遇到如下两方面的困难: I. PROPOSED PROBLEMS The properties of real gas can be expressed by the deviation of the corresponding state functions of ideal gas under the condition of “same temperature” and “co-pressure” (so-called residual functions) through the actual state functions of the gas. These residual functions can be expressed by The differential equation of the corresponding function is derived from the integration of the very low pressure (P_0) along the temperature line in conjunction with the equation of the actual gas state. However, in actual application of these integral equations, the following two difficulties are encountered: