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i was hoping this was going to explain the kg differences between the original and the copies. instead it just resolves it by changing the standard. good for science i guess, sad for my curiosity

We actually know why. Check the paper series "Stability of reference masses" published in Metrologia. Summary: mercury contamination.

Before I was disturbed by the change in apparent mass without explanation.

Now I'm disturbed that the people working in these laboratories were exposed to mercury themselves. Nasty stuff.

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