DocumentCode
2128166
Title
Determination of the Avogadro constant from precision density measurements on a silicon sphere
Author
Kenny, M.J. ; Walsh, C.J. ; Leistner, A.J. ; Fen, K. ; Giardini, W.J. ; Wielunski, L.S. ; Ward, B.R.
Author_Institution
Nat. Meas. Lab., CSIRO, Lindfield, NSW, Australia
fYear
2000
fDate
14-19 May 2000
Firstpage
184
Lastpage
185
Abstract
Density measurements with relative uncertainty of 1/spl times/10/sup -7/ have been made on a highly polished 1 kg single crystal silicon sphere. The molar mass, crystal quality and lattice parameter have been measured elsewhere, enabling a determination of the Avogadro constant to be made. The purpose is to obtain a definition of the kilogram in terms of a specific number of /sup 12/C atoms.
Keywords
atomic mass; constants; density measurement; mass measurement; measurement uncertainty; silicon; 1 kg; Avogadro constant determination; Si; crystal quality; kilogram definition; lattice parameter; molar mass measurement; polished single crystal silicon sphere; precision density measurements; relative uncertainty; sphere roundness; Atmospheric measurements; Atomic measurements; Density measurement; Fabrication; Laboratories; Lattices; Optical interferometry; Optical surface waves; Silicon; Wavelength measurement;
fLanguage
English
Publisher
ieee
Conference_Titel
Precision Electromagnetic Measurements Digest, 2000 Conference on
Conference_Location
Sydney, NSW, Australia
Print_ISBN
0-7803-5744-2
Type
conf
DOI
10.1109/CPEM.2000.850937
Filename
850937
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