本文以统计热力学中的BH微扰理论为基础,建立了一种推算实际气体比定容热容的方法。用这种方法对20余种实际气体在饱和线上和气相区的比定容热容进行了推算。计算结果表明,本文方法能推算普通气体、氟利昂类气体、烷烃类气体的比热容,在饱和线上推算的平均相对偏差为1.10%,过热区为1.46%,最大相对偏差不超过6%。 Based on the theory of BH perturbation in statistical thermodynamics, a method to calculate the specific heat capacity of a specific gas is established. In this method, more than 20 kinds of real gases in the saturation line and the gas phase than the specific heat capacity were calculated. The calculation results show that the specific heat capacity of ordinary gas, Freon gas and alkane gas can be calculated by this method. The average relative deviation estimated from saturation line is 1.10%, overheated zone is 1.46% and the maximum relative deviation is less than 6%.