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

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DOIResolve DOI: http://doi.org/10.1088/0026-1394/49/1/L03
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TypeArticle
Journal titleMetrologia
ISSN0026-1394
Volume49
Issue1
PagesL8L10
SubjectAvogadro constant; Boltzmann constants; Elementary charge; Equivalence principles; Fundamental constants; High precision; Mechanical force; Parts per billion; Planck constants; Single atoms; Watt balance; Engineering; Metallurgical engineering; Metric system
AbstractThe 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.
Publication date
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedYes
NPARC number21270142
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Record identifier4bfa23b0-263d-482c-914b-869862aca8ef
Record created2014-01-06
Record modified2016-05-09
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