AIR DENSITY DETERMINATION USING 1 KG BUOYANCY MASS COMPARISON(III) |
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| Jin-Wan Chung, Kyung-Ho Chang, Woo-Gab Lee, Kwang-Pyo Kim |
- Abstract:
- In calibration of secondary 1 kg stainless steel mass standard from a platinum-iridium kilogram prototype, a major uncertainty arises from the measurement of air density for the buoyancy correction. This paper is continued to the reference. An experimental determination of air density using buoyancy pairs and a vacuum balance has been carried out and its results were compared with those of the CIPM formula 81/91. The environmental measurement instruments used for this experiment are different from those previously used. Also the true mass difference between buoyancy pairs in vacuum was measured at mass laboratory of NMIJ in Japan and compared with the KRISS result. The disagreement between air density measurements by the 1 kg BA-pair and those by CIPM formula is 5.1 x 10-4 kg/m³, but the standard deviation of the difference between both methods has been improved, to 5.3 x 10-5 kg/m³ compared to 1.5 x 10-4 kg/m³ by the previous experiment.
- Keywords:
- air density, buoyancy, mass
- Download:
- IMEKO-TC3-2002-038.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC3
- Event name:
- Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
- Title:
18th Conference on Force, Mass and Torque (together with 8th HARDMEKO TC5 Conference on Hardness Measurement and 1st TC20 Conference on Civil Engineering Metrology)
- Place:
- Celle, GERMANY
- Time:
- 24 September 2002 - 26 September 2002