The ten milestones of science in 2018 | Science

The ten milestones of science in 2018 | Science



The kilo is redefined

Starting next year, the unit of mass that defines the kilo will not be a physical object, but a value derived from a constant of nature. The kilogram was the last fundamental unit whose definition still depended on the magnitude of a physical object, locked with three keys in the basement of the Breteuil Pavilion on the outskirts of Paris.

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