On May 20th, the kilogram will no longer be defined by a lump in France

On May 20th, the kilogram will no longer be defined by a lump in France
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The change has been years in the making, and on May 20th, three other units of measurement — the ampere, kelvin and mole — will also get new definitions. Those proved to be easier to update, as they weren’t based on a Victorian-era lump in France. The kilo …
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