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On the redefinition of the kilogram

B N Taylor and P J Mohr

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LETTER TO THE EDITOR

A new definition of the kilogram based on the relations E = mc2 and E = hν is proposed, motivated by recent progress in the development of moving-coil watt balances. Such a balance together with the definition promises to provide a practical means of directly calibrating standards of mass.


PACS

06.30.Dr Mass and density

07.50.-e Electrical and electronic instruments and components

06.20.F- Units and standards

Subjects

Instrumentation and measurement

Dates

Issue 1 (February 1999)



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