Abstract
During the last two decades new cryogenic phenomena, such as the ac Josephson Effect and the Quantum Hall Effect, have been applied to Metrology allowing the electrical units to be referred to the values of fundamental physical constants. To be consistent with SI, these constants must be determined in terms of mechanical quantities. The accuracy of these determinations is improving to such an extent that the constancy of the prototype Kilogram could be tested using electrical quantum standards in the foreseeable future.
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