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http://dx.doi.org/10.5757/JKVS.2013.22.5.231

New Method of Volume Measurement for Reference Weights of a Pressure Balance Using a Gas Pycnometer  

Lee, Yong Jae (Korea Research Institute of Standards and Science)
Lee, Woo Gab (Korea Research Institute of Standards and Science)
Mohammed, Mohammed Abdurahman (Korea Research Institute of Standards and Science)
Park, Yon-Kyu (Korea Research Institute of Standards and Science)
Oh, Chae Yoon (Chonbuk National University)
Publication Information
Journal of the Korean Vacuum Society / v.22, no.5, 2013 , pp. 231-237 More about this Journal
Abstract
New method of volume measurement for reference weights of a pressure balance using a gas pycnometer is proposed. The result of volume measurement of proposed method shows the uncertainties of approximately 0.2% at the level of confidence of 95% for reference weights in the ranges of 1 kg, 2 kg, and 5 kg. This measuring system consists of a sample chamber, an expansion chamber, a precision pressure gage, a precison thermometer, a vacuum pump, and helium as a medium gas. The measurement principle of this proposed method is based on Boyle's law. This method will contribute a reliability of the volume measurements of reference weights for a pressure balance to the national measurement standard.
Keywords
Pressure balance; Reference weight; Gas pycnometer; Volume; Density; Uncertainty;
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