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Old 11-14-2010, 11:25 PM
Chronos Chronos is offline
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Join Date: Jan 2000
Location: The Land of Cleves
Posts: 75,153
they should just say take 1 carbon-12 atom and multiply till you get 1 kilo. I don't get the standard block I mean are scales really calibrated using that? I doubt it so whats the point?
In practice, what's usually done is that you use the primary standard to make a bunch of secondary standards for major national labs around the world, and then you use those secondary standards to make tertiary standards that are used by all the other labs that need precise standards. And yes, the process of making those secondary and tertiary standards does involve putting the primary and secondary standards on scales of some sort.