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2007-09-21

A better definition for the kilogram? Scientists propose a precise number of carbon atoms


A better definition for the kilogram? Scientists propose a precise number of carbon atoms from PhysOrg.com

How much is a kilogram? It turns out that nobody can say for sure, at least not in a way that won’t change ever so slightly over time. The official kilogram – a cylinder cast 118 years ago from platinum and iridium and known as the International Prototype Kilogram or “Le Gran K” – has been losing mass, about 50 micrograms at last check. The change is occurring despite careful storage at a facility near Paris.

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