Articlehybrid2014

Towards a new SI: a review of progress made since 2011

Martin J T Milton · Richard Davis · Nick Fletcher

71 citations0/0 files storedMetrologia

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

Abstract

In 2011, the General Conference on Weights and Measures (CGPM) confirmed its intention to adopt new definitions for four of the base units of the SI based on fixed numerical values of selected constants. These will be the kilogram, the ampere, the kelvin and the mole. The CGPM was not able to adopt the new definitions at that time because certain experimental and coordination work was not complete. This paper reviews criteria proposed by the Consultative Committees of the CIPM for such a 'new SI' to be adopted and reports on recent progress with work to address them. We also report on work being undertaken to demonstrate that the most important technical aspects of realizing such a new system are practicable. The progress reported here confirms the consensus developing amongst the Consultative Committees and the National Metrology Institutes that it will be possible for the CGPM to adopt these new definitions in 2018.

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References

2012CODATA recommended values of the fundamental physical constants: 2010 2014Acoustic gas thermometry 2005Redefinition of the kilogram: a decision whose time has come 2012Watt balance experiments for the determination of the Planck constant and the redefinition of the kilogram 2005CODATA Recommended Values of the Fundamental Physical Constants: 2002 | NIST 2006Determination of the Boltzmann constant—status and prospects 2011Towards the redefinition of the kilogram: a measurement of the Planck constant using the NPL Mark II watt balance 2006Considerations on future redefinitions of the kilogram, the mole and of other units

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