LINK New kilogram standard: how the SI unit of mass is being redefined - Vox
long read but it boils down to knowing what the Kibble Balance is
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By setting a final value of the Planck constant — the units of which include the kilogram, much like the units of the speed of light include the meter — the size of a kilogram is forever stable. You can also think of it like this: The kilogram has been anchored to the Planck constant, where it will rest, forever.
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