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A comment on An old artifact kept in a vault outside Paris is no longer the standard kilogram.

Re:An old artifact kept in a vault outside Paris is no longe... by 6006135 on Friday May 17, 2019 @03:51PM (#19942954)
Is there a reason why this took so long?
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Re:An old artifact kept in a vault outside Paris is no longe... by 6006135 on Friday May 17, 2019 @04:49PM (#19943433)
Don't know why this was downvoted.

But here is the answer [1]: "The new definition only became possible when instruments were devised to measure the Planck constant with sufficient accuracy based on the IPK definition of the kilogram."

https://en.wikipedia.org/wiki/Kilogram

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