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2018•Annalen der PhysikRequires access

The Planck Constant for the Definition and Realization of the Kilogram

Barry Wood, H. Bettin

Open publisher page 21 citations

Abstract

Abstract On May 20, 2019 the values of the Planck, h, and Avogadro, NA, constants will be fixed, revising our measurement system, the International System of Units (SI), and providing a new way to get mass traceability. While the famous energy relations mc2 and hf may remind many that the Planck constant is indeed related to mass, it is less recognized how this is also true for the Avogadro constant. These concepts are reviewed in the context of the upcoming revision of the SI. How the fixed values were chosen and how mass traceability will be maintained with the smallest uncertainty are also discussed.

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What this paper is about

Abstract On May 20, 2019 the values of the Planck, h, and Avogadro, NA, constants will be fixed, revising our measurement system, the International System of Units (SI), and providing a new way to get mass traceability. While the famous energy relations mc2 and hf may remind many that the Planck constant is indeed related to mass, it is less recognized how this is also true for the Avogadro constant. These concepts are reviewed in the context of the upcoming revision of the SI. How the fixed values were chosen and how mass traceability will be maintained with the smallest uncertainty are also discussed.

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Available abstract

Abstract On May 20, 2019 the values of the Planck, h, and Avogadro, NA, constants will be fixed, revising our measurement system, the International System of Units (SI), and providing a new way to get mass traceability. While the famous energy relations mc2 and hf may remind many that the Planck constant is indeed related to mass, it is less recognized how this is also true for the Avogadro constant. These concepts are reviewed in the context of the upcoming revision of the SI. How the fixed values were chosen and how mass traceability will be maintained with the smallest uncertainty are also discussed.

Key concepts: Avogadro constant, Kilogram, International System of Units, Planck constant, Planck mass, Constant (computer programming), Physics, Planck

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