基于液体静力称量法的纯水密度测量  

Density Measurement of Pure Water by Hydrostatic Weighing

作　　者：徐浩铭 王金涛[2] 刘翔[2] 张竟月 罗志勇[2] 顾英姿[2] 王思贤 孙斌[1] XU Hao-ming;WANG Jin-tao;LIU Xiang;ZHANG Jing-yue;LUO Zhi-yong;GU Ying-zi;WANG Si-xian;SUN Bin(China Jiliang University,Hangzhou,Zhejiang 310018,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量大学,浙江杭州310018 [2]中国计量科学研究院,北京100029

出　　处：《计量学报》2023年第1期1-5,共5页Acta Metrologica Sinica

基　　金：国家自然科学基金(52075514)。

摘　　要：分析了液体静力称量法测量密度的原理和体积测量中纯水密度的特性公式,推导了由己知密度的固体标准来测量液体密度的计算公式。利用固体密度基准量传装置,通过静力称量法为固体密度标准硅球赋值,其相对测量不确定度3×10-6(k=2)。在20℃时利用高精度液体密度测量装置,通过静力称量法将固体标准(硅球)密度传递至纯水密度,与Tanaka模型比对,E n值为0.059,比对结果等效。实验结果不仅验证了高精度液体密度测量装置,还验证了20℃纯水密度模型的理论值。The principle of density measurement by hydrostatic weighing method and the characteristic formula of pure water density in volume measurement were analyzed,and the calculation formula of liquid density measured by solid standard of known density was deduced.The weighing method assigned a value to the solid density standard silicon sphere,and the relative measurement uncertainty was 3×10-6(k=2).Finally,using a high-precision liquid density measuring device at 20℃,the density of the solid standard(silicon sphere)was transferred to the density of pure water by static weighing method.Compared with the Tanaka model,the E n value was 0.059,and the comparison results were equivalent.The experimental results not only verify the high-precision liquid density measurement device,but also verify the theoretical value of the 20℃pure water density model.

关 键 词：计量学 密度测量 静力称量法 纯水 Tanaka模型 

分 类 号：TB933[一般工业技术—计量学]