[time-nuts] One Kg Quartz Resonator

Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Jan 22 19:38:56 UTC 2013


Poul-Henning Kamp wrote:
> Content-Type: text/plain; charset=ISO-8859-1
> --------
> In message<7CC93B1ACC5743A3B5536DBF798B7016 at 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



More information about the Time-nuts_lists.febo.com mailing list