Historic Vote Ties Kilogram and Other Units to Natural Constants | NIST

Historic Vote Ties Kilogram and Other Units to Natural Constants  | NIST

Historic Vote Ties Kilogram and Other Units to Natural Constants 

Versailles, France—A convocation of delegates representing 60 countries voted today in Versailles to implement the most significant change to the International System of Units (SI) in more than 130 years. For the first time, all measurement units will be defined by natural phenomena rather than by physical artifacts. The event was the 26th General Conference of Weights and Measures and was hosted by the International Bureau of Weights and Measures.

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