Sorry, Primary Kilogram, But We Are Dumping You
Posted @ 1/14/2019 10:48 AM
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.
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After decades of research, the kilogram has been retired and replaced with a reproducible equivalent, the SI or International System of Units. Now, none of the defining constants and primary standards are tied to a single physical artifact.