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Science in a Minute 111918 Weights and Measures Now Defined by Natural Phenomena


Science in a Minute 111918 Weights and Measures Now Defined by Natural Phenomena
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The standard, which has defined the kilogram since the late 19th century has been based on Le Grand K, a chunk of platinum-alloy stored in France. Delegates, representing 60 countries voted to redefine the kilogram standard, as well as those for 3 other weights and measures based on quantum mechanics constants.

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