A system of weights and measures that uses the gram, meter and liter as its primary units of weight, distance and capacity. The metric system is the primary standard used all over the world except in ...
Update, May 20th, 2019, 10AM ET: This article was originally published in November 2018. As of May 20th, 2019, World Metrology Day, the new definition of the kilogram based on Planck’s constant has ...
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