[personal profile] eub
http://sciencenews.org/view/generic/id/64376/title/Holy_moley
Currently, the Avogadro number is set by a committee that averages the results from different experiments.

Wouldn't it be a little dispiriting to be on the committee to set the value of a physical constant? I bet they don't think of it as setting.

Though really, I have to admit, the committee is better than the platinum-iridium slug in a vault.

Wikipedia adds that the silicon sphere they're counting atoms in is cut from "a 4.8-kg single crystal of isotopically-enriched silicon (99.94% 28Si)".

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