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Effective from 20 May 2019, the kilogram is now defined in terms of the numerical value of the Planck constant h. Replacing the artefact definition of the kilogram by a new one based on the mass of a particle, or the atomic mass constant mu, would have been preferable for ease of understanding, among other reasons. In this paper we will discuss some educational limitations of teaching to different audiences the new definition and corresponding realizations of the kilogram.
JSSS | Articles | Volume 10, issue 1
J. Sens. Sens. Syst., 10, 1–4, 2021
https://doi.org/10.5194/jsss-10-1-2021

Special issue: Sensors and Measurement Science International SMSI 2020

J. Sens. Sens. Syst., 10, 1–4, 2021
https://doi.org/10.5194/jsss-10-1-2021

Feature article 21 Jan 2021

Feature article | 21 Jan 2021

Explaining to different audiences the new definition and experimental realizations of the kilogram

Joaquín Valdés

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Cited articles

Becker, P., De Bièvre, P., Fujii, K., Glaeser, M., Inglis, B., Luebbig, H., and Mana, G.: Considerations on future redefinitions of the kilogram, the mole and of other units, Metrologia, 44, 1–14, https://doi.org/10.1088/0026-1394/44/1/001, 2007. 
BIPM: SI Brochure, 9th Edn., Appendix 2, 1–4, available at: https://www.bipm.org/utils/en/pdf/si-mep/SI-App2-kilogram.pdf (last access: 18 January 2021), 2020. 
Chao, L. S., Sclamminger, S., Newell, D. B., and Pratt, J. R.: A LEGO watt balance: An apparatus to determine a mass based on the new SI, Am. J. Phys., 83, 913–922, https://doi.org/10.1119/1.4929898, 2015. 
Cladé, P., Biraben, F., Julien, L., Nez, F., and Guellati-Khelifa, S.: Precise determination of the ratio hmu: a way to link microscopic mass to the new kilogram, Metrologia, 53, A75–A82, https://doi.org/10.1088/0026-1394/53/5/A75, 2016. 
Davis, R. S.: What Is a Kilogram in the Revised International System of Units (SI)?, J. Chem. Educ., 92, 1604–1609, https://doi.org/10.1021/acs.jchemed.5b00285, 2015. 

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Short summary
Effective from 20 May 2019, the kilogram is now defined in terms of the numerical value of the Planck constant h. Replacing the artefact definition of the kilogram by a new one based on the mass of a particle, or the atomic mass constant mu, would have been preferable for ease of understanding, among other reasons. In this paper we will discuss some educational limitations of teaching to different audiences the new definition and corresponding realizations of the kilogram.
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