Articlebronze2007

Modernizing the SI: towards an improved, accessible and enduring system

Martin J T Milton · Jonathan M. J. Williams · Seton J. Bennett

39 citations0/0 files storedMetrologia

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Scientific Measurement and Uncertainty Evaluation Calibration and Measurement Techniques Advanced Electrical Measurement Techniques

Abstract

Recent proposals to redefine four of the base units of the International System (SI) have stimulated some debate as to how the SI might best be developed to meet changes in requirements. In this paper we consider whether the proposals are a timely and proportionate response to those changes in requirements that can be identified today. We conclude that, whilst the proposed changes to the definitions of the mole and kelvin appear to have some advantages, the case for changes in the definitions of the ampere and the kilogram is less well made at the present stage of development of the key experiments involved.

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References

2005CODATA recommended values of the fundamental physical constants: 2002 1994Quantities, Units and Symbols in Physical Chemistry 2006Redefinition of the kilogram, ampere, kelvin and mole: a proposed approach to implementing CIPM recommendation 1 (CI-2005)1985The international vocabulary of basic and general terms in metrology 2001Primary methods for the measurement of amount of substance 1999A Capacitance Standard Based on Counting Electrons 2005Redefinition of the kilogram: a decision whose time has come 2006Determination of the Boltzmann constant—status and prospects

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