CNN Top News - The kilogram is about to be redefined

2018.11.14 12:05

The kilogram is about to be redefined

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For more than 100 years Paris has been home to Le Grand K, a block of metal that defines the precise weight of a kilogram.

원문출처 : https://www.cnn.com/2018/11/13/world/kilo-measurement-scli-intl/index.html

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