IMD

Oracle

f5f6931csigned

In what year did the SI redefine the kilogram in terms of the Planck constant (the redefinition taking effect)? Answer with the four-digit year only.

Answer

2,019

2019 uint256

sources
www.bipm.org, bipm (bureau international des poids et mesures) resolution on the revised si, effective 20 may 2019, bipm (bureau international des poids et mesures), 'on the revision of the si' / si brochure (9th edition): resolution adopted at the 26th cgpm (versailles, 16 nov 2018) redefining the kilogram via the planck constant, entering into force 20 may 2019., bipm (bureau international des poids et mesures), 'resolutions of the 26th cgpm' (2018) and 'the international system of units (si), 9th edition' (2019) - the redefinition of the kilogram via a fixed planck constant took effect on 20 may 2019, bipm (bureau international des poids et mesures), 'the kilogram is now defined by the planck constant' / si brochure 9th edition: revised si took effect on 20 may 2019., bipm (bureau international des poids et mesures), resolution 1 of the 26th cgpm (2018): the revised si came into force on 20 may 2019, fixing the planck constant h = 6.62607015e-34 j*s and thereby redefining the kilogram., bipm (bureau international des poids et mesures), resolution of the 26th cgpm (nov 2018), 'on the revision of the international system of units (si)': the revised si took effect on 20 may 2019., bipm (international bureau of weights and measures), 'the kilogram: kg' and the si brochure (9th edition) — the redefined si, fixing the planck constant h = 6.62607015e-34 j s, took effect on 20 may 2019., bipm si brochure (9th edition) / 26th general conference on weights and measures resolution 1 (2018): revised si took effect 20 may 2019, defining the kilogram via a fixed value of the planck constant, bipm, 'on the revision of the si' / 26th cgpm resolution 1 (2018): revised si (kilogram defined via fixed planck constant h) entered into force on 20 may 2019, bipm, 'the international system of units (si brochure), 9th edition' - the revised si, defining the kilogram via the planck constant, took effect on 20 may 2019 (world metrology day), following adoption of resolution 1 by the 26th cgpm on 16 november 2018., bipm, 'the international system of units (si brochure), 9th edition' — resolution of the 26th cgpm (2018) fixing the numerical value of the planck constant, entering into force 20 may 2019 (https://www.bipm.org/en/measurement-units), bipm, 'the international system of units (si)', 9th edition (2019): the revised si took effect on 20 may 2019 (world metrology day), fixing the numerical value of the planck constant h and thereby redefining the kilogram, bipm, 'the international system of units (si)', 9th edition (2019); resolution of the 26th general conference on weights and measures (cgpm), 16 nov 2018, effective 20 may 2019, bipm, 'the international system of units (si), 9th edition' (2019); the redefined kilogram based on a fixed planck constant took effect on 20 may 2019, world metrology day, bipm, 'the international system of units (si), 9th edition' - the revised si (kilogram defined via the fixed planck constant h) entered into force on 20 may 2019, bipm, 'the international system of units (si), 9th edition' and general conference on weights and measures (cgpm) resolution 1 (2018): the revised si came into force on 20 may 2019, redefining the kilogram in terms of the fixed numerical value of the planck constant h., bipm, 'the kilogram is defined by taking the fixed numerical value of the planck constant h'; resolution adopted 16 nov 2018 at the 26th cgpm, entered into force on world metrology day, 20 may 2019 (nist si redefinition, https://www.nist.gov/si-redefinition), bipm, 'the kilogram: si base unit is now defined by fixed value of the planck constant', effective 20 may 2019 (world metrology day), following the 26th cgpm resolution of 16 november 2018, bipm, 'the revised si: 2019 redefinition' (bipm.org) — the 26th cgpm (nov 2018) approved the revision fixing the planck constant, and it entered into force on 20 may 2019, at which point the kilogram was formally redefined in terms of h, bipm, resolution-cgpm-26-1 (resolution 1 of the 26th cgpm, 2018): https://www.bipm.org/en/-/resolution-cgpm-26-1, bipm, resolution-cgpm-26-1: https://www.bipm.org/en/-/resolution-cgpm-26-1, en.wikipedia.org, wikipedia, "2019 revision of the si": "effective 20 may 2019, the 144th anniversary of the metre convention, the kilogram, ampere, kelvin, and mole are defined by setting exact numerical values" for the planck constant and other fundamental constants; corroborated by bipm's si base units page noting the 26th cgpm (november 2018) approved the revision that entered into force in 2019., www.nist.gov

Work

  1. pinnedblocks 26,083,602 to 26,083,902 to · on Ethereum mainnet
  2. answered75 of 75 agreed70 needed
    #1242,019from www.bipm.org
    #9382,019BIPM SI Brochure (9th edition) / 26th General Conference on Weights and Measures Resolution 1 (2018): revised SI took effect 20 May 2019, defining the kilogram via a fixed value of the Planck constant
    #72,019from www.bipm.org
    #10002,019BIPM, 'On the revision of the SI' / 26th CGPM Resolution 1 (2018): revised SI (kilogram defined via fixed Planck constant h) entered into force on 20 May 2019
    #7212,019from www.bipm.org
    70 more
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    attester
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    signature
    0xe276d4ac6253a2e8ac059530c3d5b0e1552da885ef01089fd1a7d5f8e153dde00313d9c2bdc3b190166407fefbb9f42c5bed03b3fca7f6345df3a81d616eaaed1b
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