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Scientists vote on new way to measure a kilogram


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

181113075753-02-kilo-measurement-intl-ex

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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.

Everything from kitchen scales to gym weights around the world have been manufactured to the standard set by the cylinder of platinum iridium, which has been kept in a high-security vault in the French capital since 1889.

Different countries have their own "prototype kilograms" that serve as national standards and are calibrated to the Paris artifact. But now, scientists want to update how the weight is defined.

 

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