International_prototype_of_the_kilogram_aka_Le_Grand_K.jpg
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Summary
| Description |
English:
The International Prototype Kilogram, aka Le Grand K or the Big K or IPK stored in a vault in Paris was replaced by Planck's constant in 2019. The IPK was losing mass so the metrology community redefined the kilogram with the Planck constant.
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| Date | |
| Source | https://www.nist.gov/si-redefinition/kilogram |
| Author | BIPM |
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