TIL about “Le Grand K”, a hunk of platinum kept in a vault in a Paris, that until recently was the international prototype for a kilogram of weight. A kilogram’s weight is now defined based on the laws of the universe so as to avoid a physical object that decays over time.

Read more: https://www.npr.org/2018/11/13/666310991/say-au-revoir-to-that-hunk-of-metal-in-france-that-has-defined-the-kilogram

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