InternationalPrototypeKilogram(IPK)

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Sorry, Primary Kilogram, But We Are Dumping You

The physical kilogram, the last of the physical primary-standard artifacts, has been made obsolete. The world’s metrology and standards organization voted to define all physical standards in terms of just seven universal constants. In November 2018, in Versailles, France, representatives from the National Institute of Standards and Technologies (NIST) and 60 countries unanimously voted to