VOLUME MEASUREMENT OF 1 kg WEIGHT BY HYDROSTATIC WEIGHING USING TWO ZERODUR DENSITY STANDARD SPHERES

Kyung-Ho Chang, Yong-Jae Lee

Abstract

The hydrostatic weighing apparatus using two zerodur density standard spheres is built, and the weight
exchanger, which is composed of a weight pan with the shape of a conoid and the standard weights with a slot, is constructed. In addition, the temperature and density gradient of transfer liquid are precisely corrected according to the measuring position of the liquid container. As a result, the volume of 1 kg standard weight in a class E1 obtains 124,90388 cm³ at 20°C with a precision of 8.4·10^-5 cm³ (0,67 ppm) by hydrostatic weighing, and the measurement uncertainty shows 3.0·10^-4 cm³ (2,4 ppm) in a confidence
level of 95% with coverage factor <i>k</i> = 2.

Keywords

hydrostatic weighing, weight exchanger

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PWC-2003-TC3-011.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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