4 Units of Measurement to be Changed

Saturday, November 17, 2018 - 13:58

Scientists have decided to change the definition of four units of measurement including kilogram, 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.

These redefinitions have been in the works for some time. "This is the most important decision that the BIPM has made in maybe 100 years, which may be a slight exaggeration, but at least since 1960 when they adopted the International System of Units," Terry Quinn, emeritus director of the BIPM, told Engadget last year.

The kilogram will now be defined by the Planck Constant, while the ampere, kelvin and mole will be tied to the elementary electrical charge, the Boltzmann constant and the Avogadro constant, respectively.

The new definitions will be put into place on May 20th, 2019.

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