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oldcynic
on Feb 8, 2018
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Scientists find massive reserves of mercury in per...
NPL invented the Kibble balance that is being used in the proposed redefinition[0]. They discuss it and the Avagadro project on the page. So indeed it won't be valid much longer!
[0]
http://www.npl.co.uk/educate-explore/kibble-balance/
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[0] http://www.npl.co.uk/educate-explore/kibble-balance/