Reconciling Planck constant determinations via watt balance and enriched-silicon measurements at NRC Canada

Par Conseil national de recherches du Canada

DOI	Trouver le DOI : https://doi.org/10.1088/0026-1394/49/1/L03
Auteur	Rechercher : Steele, A. G.¹; Rechercher : Meija, J.¹Identifiant ORCID : https://orcid.org/0000-0002-3349-5535; Rechercher : Sanchez, C. A.¹; Rechercher : Yang, L.¹Identifiant ORCID : https://orcid.org/0000-0002-6896-8603; Rechercher : Wood, B. M.¹; Rechercher : Sturgeon, R. E.¹; Rechercher : Mester, Z.¹Identifiant ORCID : https://orcid.org/0000-0002-2377-2615; Rechercher : Inglis, A. D.¹
Affiliation	Conseil national de recherches du Canada. Institut des étalons nationaux de mesure du CNRC
Format	Texte, Article
Sujet	Avogadro constant; Boltzmann constants; elementary charge; equivalence principles; fundamental constants; high precision; mechanical force; parts per billion; Planck constants; single atoms; Watt balance; metallurgical engineering; metric system
Résumé	The next revision to the International System of Units will emphasize the relationship between the base units (kilogram, metre, second, ampere, kelvin, candela and mole) and fundamental constants of nature (the speed of light, c, the Planck constant, h, the elementary charge, e, the Boltzmann constant, k B, the Avogadro constant, N A, etc). The redefinition cannot proceed without consistency between two complementary metrological approaches to measuring h: a 'physics' approach, using watt balances and the equivalence principle between electrical and mechanical force, and a 'chemistry' approach that can be viewed as determining the mass of a single atom of silicon. We report the first high precision physics and chemistry results that agree within 12 parts per billion: h (watt balance) = 6.626 070 63(43) × 10 -34Js and h(silicon) = 6.626 070 55(21) × 10 -34Js. When combined with values determined by other metrology laboratories, this work helps to constrain our knowledge of h to 20 parts per billion, moving us closer to a redefinition of the metric system used around the world. © 2012 BIPM & IOP Publishing Ltd.
Date de publication	2012-01-20
Dans	Metrologia 49, nº 1 : L8–L10.
Langue	anglais
Publications évaluées par des pairs	Oui
Numéro NPARC	21270142
Exporter la notice	Exporter en format RIS
Signaler une correction	Signaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrement	4bfa23b0-263d-482c-914b-869862aca8ef
Enregistrement créé	2014-01-06
Enregistrement modifié	2024-08-12

Date de modification :: 2024-12-26