(1) How is a kilogram standardized?
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because SI has chosen it it's standard unit and indirectly the world is chosen it the standard unit of mass and weight
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The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10-34 when expressed in the unit J s, which is equal to kg m2 s -1 , where the meter and the second are defined in terms of c and ∆νCs..
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