液体饱和蒸汽压测定实验的改进

Improvement on Liquid Saturated Vapor Pressure Measurement

针对目前静态法测定液体饱和蒸汽压实验中饱和蒸汽压数值读取不合理,汽液两相未充分平衡等问题,改变传统的调整U型管两端液面等高后再读取数字压力计的方法。改进后的实验装置只需在U型管的两侧标上刻度,待系统恒温、汽-液充分平衡后,读取数字压力计的数值、温度以及U型管两端液面的高度差就可得到该温度下的液体饱和蒸汽压。该方法可解决静态法测定液体饱和蒸汽压实验中调整U型管两端液面等高耗时,空气容易倒灌的问题。

This paper presented a method to improve the unreasonable design of liquid saturated vapor pressure measurement obtained by statie method. The improvement changed the traditional method for measuring the liquid saturated vapor pressure which cannot get the pressure data until both sides of the U-type tube reach the same heigh of liquid level. After marking graduated lines on the two sides of the U-type tube, the liquid saturated vapor pressure can be easily obtained from digital pressure gauge, after the temperature becomes constant and the difference in the height of liquid level is balanced. The time-consuming problem of adjustment of liquid level height on both sides of the U-type tube and the problem of air flow baekward could be solved perfectly. It is very helpful to enhance student＇ s understanding of the concept of vapor-liquid equilibrium.