本文利用改进的倾斜式连续稀释膨胀计,在常压和298.15K 下测定了苯与环己烷以及苯与正丁醇,异丁醇,仲丁醇二元混合液的摩尔过量体积.实验结果用R—K 方程拟合,苯与环己烷过量体积的平均标准偏差为0.0009cm~3·mol.~(-1),此结果与文献值符合较好.对于苯和三种丁醇同分异构体所组成的二元体系,其摩尔过量体积在全浓度范围内均为正值,V~E 随着醇中羟基位置和烷基结构的变化,其顺序为:正丁醇<异丁醇<仲丁醇.从分子间的相互作用,对实验结果进行了定性解释. In this paper, the molar excess volume of benzene and cyclohexane, benzene and n-butanol, isobutanol, sec-butanol binary mixture was measured at atmospheric pressure and 298.15K using an improved tilting continuous dilution dilatometer. The average standard deviation of the excess volume of benzene and cyclohexane was 0.0009cm ~ 3 · mol ~ (-1) fitted by the R-K equation, and the result was in good agreement with the literature.For benzene and three butanol The binary system composed of the isomers, the molar excess volume in the full range of concentrations are positive, V ~ E with the hydroxyl position of the alcohol and alkyl structure changes, the order: n-butanol Butanol