二组分系统超额体积的变温测量

The Measurement of the Excess Molar Volumes of Binary System in Changing Temperature

设计了一个改良的连续稀释型膨胀计,提高了测量精度和一轮实验的浓度测量范围.用其测量了298.15K 下苯+环已烷系统的超额体积,与文献标准数据符合良好.在288.15～308.15K的温度范围内用该仪器测量了苯+环已烷和苯+正已烷两个二组分系统在不同温度下的超额体积.实验表明两(?)系统的超额体积随温度的变化各自显示不同的规律.

An improved dilution dilatometer is designed.The precision and theconcentration range of one round experiment of measurement are increased.The dilatometer has been used to make a series of measurements of themolar excess volume of benzene+cyclohexane at 298.15K;the results meetwell with those of previous measurement.And it has been used to makea series of measurement of the molar excess volume of benzene+cyclohexaneand benzene+n-hexane at temperatures from 288.15K to 308·15K;the resu-lts meet with those of previous measurement.It has shown that excessvolumes of mixing for the two binary mixture;very with the change oftemperature.