Acta Metrologica Sinica  2011, Vol. 32 Issue (1): 40-43    DOI: 10.3969/j.issn.1000-1158.2011.01.09
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Study on Air Density Measurement for Measuring Weights
WANG Xiao-lei,WANG Jian,ZHONG Rui-lin,ZHANG Yue,CAI Chang-qing,YAO Hong,DING Jing-an
National Institute of Metrology, Beijing 100013, China
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Abstract  To determine air density for high accuracy measurement of the weights, the method using the recommended equation is studied. According to the CIPM-2007 equation, an equipment of air density measurement that for high accuracy measurement of the weights is developed. Measurement of temperature, humidity, pressure and CO2 are integrated on it to measure air density automatically. Comparing with the results using approximation formula for air density, the relative error of 0.022% is achieved when CO2 is 937.4×10-6. The experimental results prove that additional measurement of CO2 can improve accuracy of air density measurement.
Key wordsMetrology      Air density      Mass      Weight      Air buoyancy correction      CIPM-2007 equation     
PACS:  TB92  
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WANG Xiao-lei
WANG Jian
ZHONG Rui-lin
ZHANG Yue
CAI Chang-qing
YAO Hong
DING Jing-an
Cite this article:   
WANG Xiao-lei,WANG Jian,ZHONG Rui-lin, et al. Study on Air Density Measurement for Measuring Weights[J]. Acta Metrologica Sinica, 2011, 32(1): 40-43.
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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2011.01.09     OR     http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2011/V32/I1/40
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