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Object

Kibble balance

A Kibble balance is displayed within a glass enclosure, featuring a coil and a metallic base with a clock-like mechanism at the bottom.

A device that compares a mechanical weight against an electromagnetic force generated by a current-carrying coil in a magnetic field, in two distinct modes — weighing and velocity — so that the result depends only on electrical quantities tied to the Planck constant. Invented in 1975 by the British physicist Bryan Kibble at the National Physical Laboratory. Originally called a watt balance; renamed after Kibble's death in 2016.

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