SI units Archives | The American Ceramic Society

SI units

Video: How scientists redefined the kilogram

By Lisa McDonald / November 28, 2018

Researchers measured Planck’s constant to more accurately define the kilogram. As of November 16, all seven base SI units rely on fundamental constants.

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Other materials stories that may be of interest

By Lisa McDonald / November 21, 2018

Bionic mushrooms, indoor air quality risk from 3-D printers, and other materials stories that may be of interest for November 21, 2018.

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Video: Scientists look to define kilogram with a super-round silicon sphere

By Eileen De Guire / August 23, 2013

   The  kilogram is the only base unit in the SI system defined by an object—a platinum-iridium alloy cylinder kept in a vault in France. Efforts are underway to define the kilogram based on fundamental material properties. (Credit: Muller; YouTube.) Stronger! Faster! Cheaper! These are the daily calls-to-action of engineers, and progress depends on the…

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