Researchers measured Planck’s constant to more accurately define the kilogram. As of November 16, all seven base SI units rely on fundamental constants.
Read MoreBionic mushrooms, indoor air quality risk from 3-D printers, and other materials stories that may be of interest for November 21, 2018.
Read MoreThe 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…
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