Corrigendum to the 2014 NRC determination of Planck’s constant

Sánchez, C.; Wood, B.M.; Green, R G; Liard, J.; Inglis, D.

doi:10.1088/0026-1394/52/4/l23

Cited by 15 publications

(12 citation statements)

References 2 publications

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“…As a consequence, the calibration of all masses in this time interval had to be corrected. NIST and NRC have published corrections to their measurements of h using newly calculated SI values of their working masses [ 139 , 141 ]. Table 4 shows the latest number, including the mass correction.…”

Section: Existing Implementations and Their Resultsmentioning

confidence: 99%

The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass

2016

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The redefinition of the SI unit of mass in terms of a fixed value of the Planck constant has been made possible by the Kibble balance, previously known as the watt balance. Once the new definition has been adopted, the Kibble balance technique will permit the realisation of the mass unit over a range from milligrams to kilograms. We describe the theory underlying the Kibble balance and practical techniques required to construct such an instrument to relate a macroscopic physical mass to the Planck constant with an uncertainty, which is achievable at present, in the region of 2 parts in 10 8 . A number of Kibble balances have either been built or are under construction and we compare the principal features of these balances.

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Section: Existing Implementations and Their Resultsmentioning

confidence: 99%

The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass

2016

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“…the determination of precise values of the Planck and Avogadro constants concordant with each other, had been achieved by 2015, when these constants had been measured with u r = 2 10 -8 by the silicon sphere method [11] and the watt balance method [10,12]. Thus, the results of the recent NMIJ, BIPM, PTB, INRIM, NIST and NRC experiments [10][11][12] allow to achieve the 10 -8 level demanded by the 24th and 25th CGPM decisions [3] and, most likely, will bring to the adoption of new definitions of the kilogram and mole in 2018. There is yet time to consider the advantages and shortcomings of the suggested new definitions and their different versions taking into account the fulfillment of appropriate criteria and further progress in precision of relevant DC measurements' results.…”

Section: Discussionmentioning

confidence: 97%

“…We The aim adopted about ten years ago, i.e. the determination of precise values of the Planck and Avogadro constants concordant with each other, had been achieved by 2015, when these constants had been measured with u r = 2 10 -8 by the silicon sphere method [11] and the watt balance method [10,12]. Thus, the results of the recent NMIJ, BIPM, PTB, INRIM, NIST and NRC experiments [10][11][12] allow to achieve the 10 -8 level demanded by the 24th and 25th CGPM decisions [3] and, most likely, will bring to the adoption of new definitions of the kilogram and mole in 2018.…”

Section: Discussionmentioning

confidence: 99%

“…For instance, in the present SI the definitions of the kilogram, the ampere, the kelvin and the mole are based on the fixed values of the IPK mass (m(K)), 0 , the triple point of water (T tpw ) and the molar mass of 12 C (M( 12 C)). In the work [9] the present SI is named as System A.…”

Section: Analysis Of DC Sets Proposed For Redefinition Of the Four Ba...mentioning

confidence: 99%

“…The purpose of this paper is to discuss critically proposed new definitions of the four SI units in the light of the current theoretical and experimental results [9][10][11][12][13]. We introduce a new notion, namely, a constant's order in a given system of units and suggest a list of criteria for a choice of the appropriate DC set.…”

Section: Introductionmentioning

confidence: 99%

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An Alternative Set of Defining Constants for Use in Redefining the Four Units of the International System of Units

Khruschov

2017

Meas Tech

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We discuss different sets of constants with fixed values for a transition to new definitions of four SI units (the kilogram, mole, ampere and kelvin). A notion of constant's order in a given system of units is suggested. Several criteria for the optimum choice of constants and an alternative set of fixed constants applicable for new definitions of the four SI units are considered. We analyse the set consisting of the Planck constant, the Avogadro constant, the Boltzmann constant and the magnetic constant.

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Realisation of Mass Unit

Gupta¹

2019

Springer Series in Materials Science

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Corrigendum to the 2014 NRC determination of Planck’s constant

Cited by 15 publications

References 2 publications

The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass

The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass

An Alternative Set of Defining Constants for Use in Redefining the Four Units of the International System of Units

Realisation of Mass Unit

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