考虑分子间长程力的范德瓦尔斯方程

VAN DER WAALS EQUATION WITH TAKING INTO ACOUNT LONG-RANGE FORCE BETWEEN MOLECULES

在考虑了刚性分子球之间的长程相互作用的基础上,计算了由此引起的内压强,给出了描述真实气体状态变化规律的范德瓦尔斯方程。与只考虑短程相互作用(即分子间引力的牛球近似)的结果相比较,发现尽管二者给出的定性结论相一致,但短程相互作用近似减小了范氏方程中的修正常数a。

With taking into account long-range interaction between molecules. This paper calculates the internal pressure caused by it and expands Van der Waals equation which is used to describe the varing law of real gas. Comparing with the results obtained by considering short-range interaction (that is, the half-sphere approximation about the attractive force between molecules), it is found that the short-range interaction approximation lessens the correction constant a, although the two results are in agreement with each other qualitatively.