摘要
本文用统计热力学方法导得了液体饱和蒸气压与蒸发热间的关系式。液相的正则配公函数采用了普遍化ｖａｎｄｅｒＷａａｌｓ配分函数，液体分子的内配分函数被假定为独立子的内配分函数与一个相互作用因子的乘积，这个因子仅为液体密度的函数，且随密度的减小而逐渐趋近于１。对七种有代表性液体的检验结果表明，这个关系式能在宽阔的温度范围内满意地显示蒸发热随温度的变化规律。
AbstractA relation between the saturated vapor pressure and the heat of vaporization for pure liquids has been derived by statistical thermodynamic method. The generalized van der Waals partition function is uSed for liquid phase,and internal p&rtition function of liquid molecules is assumed as the produCt of that of independent molecule and an interaction factor which is only function of density and gradually approach unit wity the decrease of denSity. The results of test show that the relation can describe changing rule of the heat of vaporisation with the temperature satisfactorily for seven typical liquids
