A summary of the Planck constant determinations using the NRC Kibble balance

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DOIResolve DOI: https://doi.org/10.1088/1681-7575/aa70bf
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  1. National Research Council Canada. Measurement Science and Standards
FormatText
TypeArticle
Journal titleMetrologia
ISSN0026-1394
1681-7575
Volume54
Issue3
Pages399–409
Abstract
We present a summary of the Planck constant determinations using the NRC watt balance, now referred to as the NRC Kibble balance. The summary includes a reanalysis of the four determinations performed in late 2013, as well as three new determinations performed in 2016. We also present a number of improvements and modifications to the experiment resulting in lower noise and an improved uncertainty analysis. As well, we present a systematic error that had been previously unrecognized and we have quantified its correction. The seven determinations, using three different nominal masses and two different materials, are reanalysed in a manner consistent with that used by the CODATA Task Group on Fundamental Constants (TGFC) and includes a comprehensive assessment of correlations. The result is a Planck constant of 6.626 070 133(60)  ×10−34 Js and an inferred value of the Avogadro constant of 6.022 140 772(55)  ×1023 mol−1. These fractional uncertainties of less than 10−8 are the smallest published to date.
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PublisherIOP
LanguageEnglish
Peer reviewedYes
NPARC number23002354
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Record identifier44b84344-89a5-4262-9685-de6389bf35a1
Record created2017-10-23
Record modified2019-03-11
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