本文运用统计热力学导出了一个直接由过量体积数据推算液相活度系数的新模型——EVLAC模型,本模型主要从“双液胞腔”与“局部组成”等概念出发,通过配分函数导出y-x表达式和V~E-x表达式,仅需要一个温度下的V~E-x数据即可推算出不同温度下盼恒温y-x,数据和不同压力下的恒压y-x数据,在不需要增加多元可调参数的情况下,可推广应用至多元体系。 In this paper, we use statistical thermodynamics to derive a new model, EVLAC, which estimates the liquidus activity directly from the excess volumetric data. The model mainly derives from the concept of “double liquid cell” and “local composition” Expression and V ~ Ex expression, only need a temperature of V ~ Ex data can be projected at different temperatures hope constant temperature yx, data and constant pressure yx data under different pressures, without the need to increase the multivariate adjustable parameters Case, can be extended to multi-system.