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New measurement will help redefine international unit of mass

(National Institute of Standards and Technology (NIST)) Using a state-of-the-art device for measuring mass, researchers at the National Institute of Standards and Technology (NIST) have made their most precise determination yet of Planck's constant, an important value in science that will help to redefine the kilogram, the official unit of mass in the SI, or international system of units.
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