Towards an electronic kilogram: an improved measurement of the Planck constant and electron mass


The electronic kilogram project of NIST has improved the watt balance method to obtain a new determination of the Planck constant h by measuring the ratio of the SI unit of power W to the electrical realization unit W90, based on the conventional values for the Josephson constant KJ-90 and von Klitzing constant RK-90. The value h = 6.626 069 01(34)× 10−34 J… (More)


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