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http://dx.doi.org/10.3807/KJOP.2019.30.4.133

Redefinition of the SI Base Units with Fundamental Constants  

Lee, Ho Seong (Center for Time and Frequency Metrology, Korea Research Institute of Standards and Science)
Publication Information
Korean Journal of Optics and Photonics / v.30, no.4, 2019 , pp. 133-141 More about this Journal
Abstract
Revision of the International System of Units (SI) in terms of fundamental constants was achieved by the 26th General Conference on Weights and Measures (CGPM) in November 2018. Four base units (kilogram, ampere, kelvin, and mole) of SI were redefined by fixing the values of the Planck constant h, elementary charge e, Boltzmann constant k, and Avogadro constant $N_A$ respectively. In this paper the scientific principle for redefining the kilogram from the Planck constant with the Kibble balance is explained as an example. The revised SI takes effect on May 20, 2019.
Keywords
SI; Fundamental constants; Kilogram; Planck constant; Kibble balance;
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