• 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