But can the number and type of atoms in such a standard be counted?
Otherwise its not a primary standard.
Bruce
Bob Camp wrote:
Hi
The objective of the Avogadro Project seems to be getting to an accuracy of
0.03 ppm from a current level of ~ 10X that. The suggestion in the paper is
that a quartz resonator could be monitored for change to a much tighter
level than that.
Bob
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Bruce Griffiths
Sent: Tuesday, January 22, 2013 2:39 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] One Kg Quartz Resonator
Poul-Henning Kamp wrote:
Content-Type: text/plain; charset=ISO-8859-1
--------
In message<[email protected]>, "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.htm
l
Essentially one would then measure mass of such standards by counting atoms.
Bruce
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