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The International System of Units (SI, from the French Système International d’Unités) is about to be radically redefined.  The seven familiar base units will be replaced by constants of nature that are, on the whole less familiar to the general public. No more will mass be defined by a kilogram in a vault in Paris.

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Credit: NIST

David Newell of the National Institute of Standards and Technology (NIST) explains the proposed changes in this article in Physics Today.

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