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Amount of substance and the proposed redefinition of the mole

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M J T Milton1 and I M Mills2

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There has been considerable discussion about the merits of redefining four of the base units of the SI, including the mole. In this paper, the options for implementing a new definition for the mole based on a fixed value for the Avogadro constant are discussed. They are placed in the context of the macroscopic nature of the quantity amount of substance and the opportunity to introduce a system for molar and atomic masses with unchanged values and consistent relative uncertainties.


PACS

06.20.Dk Measurement and error theory

06.20.Jr Determination of fundamental constants

06.20.fa Units

Subjects

Instrumentation and measurement

Dates

Issue 3 (June 2009)

Received 24 February 2009, in final form 21 April 2009

Published 11 May 2009



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