Article2019

Understanding the Revised SI: Background, Consequences, and Perspectives

Tara Cubel Liebisch · J. Stenger · J. Ullrich

37 citations0/0 files storedAnnalen der Physik

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Scientific Measurement and Uncertainty Evaluation Relativity and Gravitational Theory Advanced Frequency and Time Standards

Abstract

Abstract This article expounds the significance of the revision of the international system of units, the SI, approved by the General Conference on Weights and Measures (CGPM) in 2018. The revised SI implements a construct of a system of units based on fixing the numerical values of constants of nature, the “defining constants.” This fundamental development in the SI is not only elegant and infinitely sustainable, but moreover will drive future technological innovation. This article provides an historical overview and discusses the underlying principles and consequences of the revised SI: from the history of Planck's proposal for creating a system of units “valid for all times and civilizations,” to the scientific and technological motivations for the revision and the expected resulting innovations.

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References

2016CODATA recommended values of the fundamental physical constants: 2014 2017The CODATA 2017 values ofh,e,k, andNAfor the revision of the SI 2005Redefinition of the kilogram: a decision whose time has come 2017Data and analysis for the CODATA 2017 special fundamental constants adjustment 2001History and progress in the accurate determination of the Avogadro constant 2012Precision comparison of the quantum Hall effect in graphene and gallium arsenide 2014Principles of a new generation of simplified and accurate watt balances 2018The Planck-Balance—using a fixed value of the Planck constant to calibrate E1/E2-weights

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