Why the kilogram was redefined after 130 years of using the same standard
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Why the kilogram was redefined after 130 years of using the same standard
For more than a century, the kilogram was defined by a physical metal object locked away like a treasure. The problem was simple but terrifying: that object could change over time, meaning the world’s definition of mass could drift without anyone noticing. So scientists did something wild — they rebuilt the kilogram using physics itself ...
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