用液体比重天平测定了甲基叔丁基醚 (MTBE) -苯二元系、甲基叔丁基醚 -甲基环己烷二元系在 2 93 15～ 313 15K下的密度值 ,求得过剩摩尔体积VEm。对MTBE -苯二元系 ,所测定的VEm 都是负值 ,且随着温度升高 ,VEm 的绝对值稍有增加 ;而对MTBE -甲基环己烷二元系 ,所测定的VEm 都是正值 ,且随温度升高 ,VEm 的值稍有增加。实验数据用Redlich -kister方程关联 ,用非线性回归方法求得参数 The density of methyl tert-butyl ether (MTBE) -benzene binary system and methyl tert-butyl ether-methylcyclohexane binary system at 2 93 15 ~ 313 15K were measured by liquid specific gravity balance Excess Molar Volume VEm. For MTBE - benzene binary system, the measured VEm is negative, and as the temperature increases, the absolute value of VEm slightly increased; for the MTBE - methylcyclohexane binary system, the measured VEm Is positive, and as the temperature increases, the value of VEm increases slightly. The experimental data are correlated with the Redlich-kister equation, and the parameters are obtained by the non-linear regression method