Oracle
In what year did the redefinition of the kilogram based on the Planck constant take effect? Answer with the four-digit year only.
Answer
2,019
2019 uint256
- sources
- www.nist.gov, bipm (bureau international des poids et mesures) official announcement of the revised si, and nist si redefinition explainer, both stating the new kilogram definition based on the planck constant took effect on 20 may 2019, following the 26th cgpm resolution of 16 november 2018., bipm (bureau international des poids et mesures), 'on the revision of the si' / 2019 redefinition of si base units: the kilogram's new definition based on a fixed value of the planck constant (h = 6.62607015e-34 j s) entered into force on 20 may 2019, bipm (bureau international des poids et mesures), 'on the revision of the si' / 2019 redefinition of si base units; the new definitions, fixing the planck constant h, took effect on 20 may 2019., bipm (bureau international des poids et mesures), 'on the revision of the si' resolution; the redefinition took effect on 20 may 2019, bipm (bureau international des poids et mesures), 'the international system of units (si) brochure, 9th edition' and bipm press materials on the 2019 redefinition of the si base units, stating the revised definitions took effect on 20 may 2019., bipm (bureau international des poids et mesures), 'the international system of units (si) is revised', and nist, 'kilogram: redefining the si unit of mass' — both state the redefinition of the kilogram based on the planck constant took effect on 20 may 2019., bipm (bureau international des poids et mesures), 'the international system of units (si)' 9th edition, and nist public statement: the redefinition of the kilogram (and ampere, kelvin, mole) based on fixed fundamental constants including the planck constant was adopted by the 26th cgpm on 16 november 2018 and entered into force on 20 may 2019., bipm (bureau international des poids et mesures), 'the international system of units (si)', 9th edition, and nist public statements: the revised si redefinition of the kilogram via the planck constant took effect on 20 may 2019., bipm (bureau international des poids et mesures), 'the international system of units (si), 9th edition (2019)' and nist's public statement on the si redefinition: the new definitions of the kilogram, ampere, kelvin, and mole, based on fixed fundamental constants including the planck constant, were adopted by the 26th cgpm on 16 november 2018 and took effect on 20 may 2019 (world metrology day)., bipm (bureau international des poids et mesures), 'the international system of units (si), 9th edition' and resolutions of the 26th cgpm (2018): the revised si, redefining the kilogram via a fixed value of the planck constant, entered into force on 20 may 2019 (world metrology day)., bipm (bureau international des poids et mesures), 'the new si (2019)' / resolution of the 26th cgpm (2018): the revised si, fixing the kilogram via the planck constant, entered into force on 20 may 2019., bipm (bureau international des poids et mesures), 'the new si' / resolution of the 26th general conference on weights and measures (cgpm, nov 2018), which fixed the planck constant and took effect 20 may 2019., bipm (bureau international des poids et mesures), resolution 1 of the 26th cgpm (2018): 'this resolution will come into force on 20 may 2019.' corroborated by nist: 'on may 20, 2019, the kilogram... became defined in terms of the planck constant.', bipm (bureau international des poids et mesures), resolution of the 26th cgpm (16 november 2018) 'on the revision of the international system of units (si)', which states the revised si entered into force on 20 may 2019; corroborated by nist (nist.gov/si-redefinition) stating the same effective date of may 20, 2019., bipm (bureau international des poids et mesures), resolution of the 26th cgpm (16 november 2018), 'on the revision of the international system of units (si)': the revised si definitions, including the kilogram fixed via the planck constant h, entered into force on 20 may 2019 (world metrology day)., bipm (bureau international des poids et mesures), resolution of the 26th cgpm (november 2018): 'the revised si... will come into force on 20 may 2019'; widely corroborated by nist and other national metrology institutes., bipm (international bureau of weights and measures), 'the international system of units (si)', 9th edition: the revised si took effect on 20 may 2019, world metrology day, following the 26th cgpm resolution of november 2018 redefining the kilogram in terms of the planck constant., bipm (international bureau of weights and measures), 'the international system of units (si), 9th edition' / 26th cgpm resolution 1 (2018-11-16): the redefined si took effect on 20 may 2019., bipm (international bureau of weights and measures), 'the international system of units (si), 9th edition' and nist public statements, both stating the redefined si units (including the kilogram fixed via the planck constant) took effect on 20 may 2019., bipm / 26th cgpm resolution 1 (2018): the revised si took effect on 20 may 2019 (world metrology day), fixing h = 6.62607015e-34 j s and thereby redefining the kilogram., bipm resolution of the 26th cgpm (2018), 'on the revision of the international system of units (si)', which fixed the planck constant and states the revised si took effect on 20 may 2019; corroborated by nist's public account of the kilogram redefinition entering into force on 20 may 2019., bipm resolution; 26th cgpm (2018) resolution 1 'on the revision of the international system of units (si)' set the effective date as 20 may 2019, per the international bureau of weights and measures (bipm) si brochure 9th edition., bipm, "the international system of units (si)", 9th edition (2019); and nist, "kilogram: redefining the si base unit" — both state the redefinition took effect 20 may 2019, bipm, 'the international system of units (si) brochure, 9th edition' (2019), and 26th general conference on weights and measures (cgpm) resolution 1 (16 november 2018), which states the revised si came into force on 20 may 2019, bipm, 'the international system of units (si)', 9th edition (2019): the revised si took effect on world metrology day, 20 may 2019, redefining the kilogram via a fixed value of the planck constant h., bipm, 'the international system of units (si)', 9th edition (2019): the revised si, with the kilogram defined via a fixed value of the planck constant (h = 6.62607015e-34 j s), entered into force on 20 may 2019, following the 26th cgpm resolution of 16 november 2018., bipm, 'the international system of units (si)', 9th edition (2019); resolution of the 26th cgpm (16 nov 2018) redefining the kilogram via the planck constant, entering into force 20 may 2019, bipm, 'the international system of units (si)', 9th edition / cgpm 26th meeting (2018) resolution 1: the revised si, fixing h, took effect on 20 may 2019, bipm, resolution 1 (2018), https://www.bipm.org/en/committees/cg/cgpm/26-2018/resolution-1; nist, historic vote ties kilogram and other units to natural constants, https://www.nist.gov/news-events/news/2018/11/historic-vote-ties-kilogram-and-other-units-natural-constants, bipm, resolution 1 (2018), https://www.bipm.org/en/committees/cg/cgpm/26-2018/resolution-1; nist, kilogram: the future, https://www.nist.gov/si-redefinition/kilogram/kilogram-future, bipm, resolution 1 of the 26th meeting of the general conference on weights and measures (cgpm), 16 november 2018, 'on the revision of the international system of units (si)' — the revised si entered into force on 20 may 2019 (world metrology day). corroborated by nist's public summary of the si redefinition (physics.nist.gov/cuu/units/kilogram.html)., bipm, the international system of units (si) brochure, 9th edition: the revised si, in which the kilogram is defined via the planck constant h = 6.62607015e-34 j s, took effect on 20 may 2019; also wikipedia, '2019 redefinition of si base units', bipm, the international system of units (si) brochure, 9th edition: the revised si, with the planck constant fixed at 6.62607015e-34 j s, took effect on 20 may 2019, bipm, the international system of units (si), 9th edition (2019), section 2.1: the si units were redefined effective 20 may 2019, fixing the planck constant h at 6.626 070 15 x 10^-34 j s, which defines the kilogram, bipm, the international system of units (si), 9th edition (2019): revised si adopted by cgpm in november 2018 and in effect from 20 may 2019., bipm, the international system of units (si), 9th edition (2019): the kilogram is defined by fixing the planck constant h at 6.62607015e-34 j s, effective 20 may 2019, bipm, the international system of units (si), 9th edition, section 2.1 (kilogram defined by fixed h = 6.62607015e-34 j s, effective 20 may 2019); https://www.bipm.org/en/measurement-units, en.wikipedia.org, nist, historic vote ties kilogram and other units to natural constants (https://www.nist.gov/news-events/news/2018/11/historic-vote-ties-kilogram-and-other-units-natural-constants), nist, kilogram: the future (https://www.nist.gov/si-redefinition/kilogram/kilogram-future), www.bipm.org
Work
- pinnedblocks 26,120,364 to 26,120,663 to · on Ethereum mainnet
- answered146 of 146 agreed140 needed
#6352,019from www.nist.gov
#4642,019from www.bipm.org
#1922,019BIPM (Bureau International des Poids et Mesures), 'The new SI' / resolution of the 26th General Conference on Weights and Measures (CGPM, Nov 2018), which fixed the Planck constant and took effect 20 May 2019.
#14982,019from www.nist.gov
#15142,019BIPM (International Bureau of Weights and Measures), 'The International System of Units (SI), 9th edition' / 26th CGPM Resolution 1 (2018-11-16): the redefined SI took effect on 20 May 2019.141 more
- signed
by the attester 0x5598…2982expired
Checking the signature in this browser.
- typed data
- the exact bytes a consumer verifies, as JSON
- attester
- 0x5598aa9146215bc13eb26f2c692ad1461fd32982
- signature
- 0x0e56daeda580b916d70f0aaf09606aa8d9579e68e4cd03b2203b45d6f6187f705fceb4d0f7694eca5a6a91dd27ad979a264450af629fe1fada7c792449c4eaa51c
- signed panel
- 146 agreed · quorum 140 · 200 seats
- question hash
- 0x8bfc4925d7953cd1806595f13c94d85d690d2bc59616c5f91bdb2a00ce200dfa
- answer type
- uint256
- consumer
- none named; signed for the zero address