internationalsystemofunits
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The kilogram has officially been redefined
Today, scientists voted to change the definition of the kilogram as well as three other units of measurement -- the ampere, the kelvin and the mole. The vote took place at the General Conference on Weights and Measures in Versailles, France and the new definitions will be based on "what we call the fundamental constants of nature," as Estefanía de Mirandés of the International Bureau of Weights and Measures (BIPM) told Science News, instead of the less precise definitions these measurements are currently tied to. The kilogram, for example, is defined by a physical cylinder known as Le Grand K that's stored in a vault outside of Paris.
