液体表面张力对静力称量法固体密度测量的影响

摘要

液体静力称量法是固体密度测量最常用也是测量准确度较高的一种方法.基于阿基米德原理,研究了表面张力对固体密度测量结果的影响.实验选取纯水和纯酒精2种液体作为工作介质,采用一套高准确度液体静力称量装置测量同一固体样品的密度值.实验结果表明,在表面张力小的液体(纯酒精)中固体样品密度测量结果的分散性明显优于在表面张力大的液体(纯水)中固体样品密度测量结果的分散性,为今后提高固体密度测量准确度提供参考方向.%Hydrostatic weighing is widely used in solid density measurement,and it is also a method with high accuracy.The influence of liquid surface on solid density measurement is studied based on Archimedes' Principle.A set of high accuracy hydrostatic weighing device are used to measure density of solid sample.Two different liquid with different surface tension are used as working medium.The results show that the density of measurement dispersion in low surface tension liquid is better than in high surface tension liquid.