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| Research on High Accuracy Mass Measurement of Silicon Sphere in the Dissemination of Mass Unit |
| PENG Cheng,WANG Jian |
| National Institute of Metrology, Beijing 100029, China |
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Abstract Based on the differences on material and geometry properties among silicon spheres and other regular mass standards, an improved method to determine the air buoyancy correction in the silicon sphere mass measurement was proposed. Six types of air buoyancy fluctuations were concluded by studying the real-time data of air density during the mass measurement of silicon sphere. Since the environment conditions are changeable, it was observed that the air buoyancy fluctuations of 1×10-4kg/m3 were existed between any two adjacent weighing processes in mass measurement of silicon sphere. About 15.1～30.2μg errors in the air buoyancy correction can be produced by ignoring the air density fluctuation in the mass measurement of a 1kg silicon sphere (using a 1kg platinum-iridium weight as reference standard).
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Received: 21 July 2020
Published: 23 March 2021
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2021, Vol. 42 
