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单词 kilogram(symbol: kg)
释义
kilogram(symbol: kg)

Electronics and Electrical Engineering
  • The SI unit of mass previously defined as equal to the mass of the international prototype of the kilogram, which is a platinum–iridium bar kept at Sèvres, France. From 20th May 2019, using the Kibble balance, the kilogram was redefined in terms of the Planck's constant. The redefinition should enable the measurement of a kilogram with an accuracy of a millionth of one percent.


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