New apparatus for measuring the density of mercury

被引:6
作者
Bettin, H [1 ]
Krumscheid, H [1 ]
机构
[1] Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany
关键词
D O I
10.1088/0026-1394/36/6/12
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A new apparatus is being set up for measuring the density of mercury at 20 degrees C with a relative uncertainty of 0.5 x 10(-6) by hydrostatic weighing of a sinker of known volume and mass. Two small sinkers of about 50 cm(3) were calibrated by hydrostatic comparison with silicon density standards. Thus, in the first stage, a relative uncertainty of 2 x 10(-6) of the mercury density can be reached. The quantity of mercury needed for the measurements is 1 1. Also, density comparisons of different mercury samples can be carried out with a relative uncertainty of 0.5 x 10(-6). To reach a relative uncertainty of 0.5 x 10(-6) in the density of mercury, a 500 cm(3) hollow cube is to be manufactured from tantalum. Its volume will be determined by means of an interferometer, with a relative uncertainty of 0.15 X 10(-6). Measurements will be performed for the gravitation experiment of Zurich University using 1 m(3) of mercury, and for mercury samples used in primary pressure standards. Design and results of first tests of the hydrostatic weighing apparatus are reported.
引用
收藏
页码:547 / 550
页数:4
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