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.

MATsolutions' insight:


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.


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