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The Planck Constant for the Definition and Realization of the Kilogram
Author(s) -
Wood Barry,
Bettin Horst
Publication year - 2019
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201800308
Subject(s) - avogadro constant , kilogram , international system of units , planck constant , planck mass , constant (computer programming) , physics , planck , planck energy , realization (probability) , theoretical physics , context (archaeology) , traceability , planck length , quantum mechanics , mathematics , computer science , statistics , metrology , planck scale , body weight , quantum gravity , gravitation , medicine , quantum , biology , programming language , paleontology
Abstract On May 20, 2019 the values of the Planck, h , and Avogadro, N A , 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 mc 2 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.