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Define kilogram at atomic scale

Answer»

According to the NEW DEFINITION of the kilogram, one KG is the MASS difference between c2/h νCs=1.4755214*1040 Cs atoms in the upper and lower HYPERFINE states. ... Therefore, an equivalent definition of the kilogram is: one kg is the mass of 1.475 5214*1040 photons at νCs stored in a microwave cavity.



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