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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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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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…
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