用自制的连续冲稀膨胀计,在298.15K,测定了乙醇-环己烷、环己烷-正庚烷、乙醇-正庚烷三对二元系和相应三元系的过量体积。其中二元系的实验值与文献值良好一致。另外,又利用局部组成模型进行关联,当使用三对二元系的非随机参数,对上述三元系的过量体积进行预测时,预测值与实验值基本相符。 The excess volumes of ethanol - cyclohexane, cyclohexane - n - heptane, ethanol - n - heptane three pairs of binary systems and corresponding ternary systems were measured at 298.15K using a homemade continuous dilute swell dilatometer. The experimental value of binary system is in good agreement with the literature value. In addition, the local composition model is also used for the correlation. When using the non-random parameters of three pairs of binary systems to predict the excess volume of the ternary system, the predicted value basically agrees with the experimental value.