The Definition of a Kilogram Just Changed Worldwide

Slashdot
By msmashMay 20, 2019, 1:25 pm106 pts
For over a century, the kilogram was defined by a metal cylinder in a French vault. Now, this key unit of mass is defined using the Planck constant, a fundamental figure in physics. From a report: On Monday -- World Metrology Day -- Le Grand K lost its special status as the international prototype kilogram…

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