单词 | International System of Units |
例句 | Today, atomic transitions are the foundation on which all time measurements are built: a transition in the caesium-133 atom provides a reference value that underpins the International System of Units definition of the second. Exotic helium atom lit up 2020-05-05T04:00:00Z In the case of Planck’s constant, there’s now enough confidence in its value for it to become the basis of the International System of Units definition of the kilogram that was confirmed last May. Irreproducibility is not a sign of failure, but an inspiration for fresh ideas 2020-02-11T05:00:00Z The customary units we use legally are defined in terms of the International System of Units units. Opinion | Readers critique The Post: Elvis’s legacy, the origins of turkey and a possible ‘super Earth’ 2018-11-30T05:00:00Z Henceforth, all seven units in the International System of Units, otherwise known as the S.I., will no longer be defined by material objects and instead will be defined only by abstract constants of nature. The Kilogram Is Dead. Long Live the Kilogram! 2018-11-17T05:00:00Z The International System of Units, or SI, is what allows us to communicate measurements around the globe. A massive change: Nations will vote to redefine the kilogram 2018-11-15T05:00:00Z The kilogram is the last physical unit in the International System of Units defined by a physical artifact, a platinum-iridium cylinder kept by the International Bureau of Weights and Measures in Sèvres, France. New Type of Clock Keeps Time by Weighing Atoms 2013-01-11T19:50:00Z |
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