Units of measure are getting a fundamental upgrade

Metrologists are revamping units using fundamental constants of nature

kilogram standards

TAKING MEASURE  New units based on fundamental properties of the universe will make measurements more precise. A kilogram cylinder replica (left) is safeguarded under bell jars. Ultrasmooth silicon spheres (right) will soon be used to redefine the kilogram using the Planck constant — making the kilogram prototype obsolete.

epa european pressphoto agency b.v./Alamy Stock Photo

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