Bureau International des Poids et Mesures Archives | The American Ceramic Society

Bureau International des Poids et Mesures

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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