Poul-Henning Kamp wrote:
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In message<7cc93b1acc5743a3b5536dbf798b7...@vectron.com>, "Bob Camp" writes:
There's a paper in the February IEEE UFFC transactions proposing that the SI
standard of mass be replaced with a 1 KG quartz resonator.
Has anybody ever studied if mono-isotopic quartz in the first place ?
I pressume that would be a requirement in order to link it to the
atomic weight unit ?
The current intention is to accurately measure Silicon 28 single crystal
spheres and use the result to refine the value for Avogadros number and
thus allow a redefinition of the kilogram using Avogadros number and the
mass of an atom:
http://www.ptb.de/en/aktuelles/archiv/presseinfos/pi2011/pitext/pi110127.html
Essentially one would then measure mass of such standards by counting atoms.
Bruce
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