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9:48
MSN
Veritasium
The Kilogram Fell Apart the Moment We Tried to Make It Permanent
For more than a century, a single metal cylinder locked in a vault defined the kilogram — until it began to drift. Tiny changes in mass pushed scientists to rebuild the unit from pure physics instead of physical objects. The new definition ties the kilogram to fundamental constants that cannot decay or shift. It’s one of the most ambitious ...
3 months ago
Kilogram Definition
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