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| Study on the Influence of Ambient Pressure on Liquid Density Transmission |
| ZHANG Jing-yue1,2,WANG Jin-tao1,SHI Wen-cai1,LIU Xiang1,LI Zhan-hong1,TONG Lin1,MA Xin-yu1,2 |
1. National Institute of Metrology, Beijing 100029, China
2. China Jiliang University, Hangzhou, Zhejiang 310018, China |
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Abstract As an important part of density standards, liquid density standard plays a significant role in quantity transfer and traceability. In order to correct the influence of pressure, a method is proposed to measure the compressibilities of density standard liquids at low pressure. The relationship between the density of liquid and pressure is established by a calibration measuring which device of pure water and air standard density. Compressibilities of density standard liquids were measured by vibrating-tube densimeter calibrated. According to the result, the relative change is about 1×10-6 in the density of the liquid caused by the elevation of 100 m, which verified the necessity of the correction.
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Received: 27 October 2017
Published: 11 February 2018
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Corresponding Authors:
Jintao Wang
E-mail: wangjt@nim.ac.cn
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2018, Vol. 39 
