Oracle
In what year was the kilogram redefined in terms of the Planck constant, taking effect on 20 May? Answer with the four-digit year only.
Answer
2,019
2019 uint256
- year
- The calendar year the revised kilogram definition took effect on 20 May.
- sources
- www.nist.gov, bipm (bureau international des poids et mesures) - 'the kilogram is defined by taking the fixed numerical value of the planck constant h... this definition... took effect on 20 may 2019.' (bipm.org/en/measurement-units/kg); corroborated by nist (nist.gov) coverage of the revised si entering into force on world metrology day, 20 may 2019., bipm (bureau international des poids et mesures) official announcement of the revised si, effective 20 may 2019, bipm (bureau international des poids et mesures) resolution and general conference on weights and measures (cgpm) records: the 26th cgpm adopted the revised si on 16 november 2018, with the redefinition of the kilogram based on a fixed value of the planck constant (h = 6.62607015e-34 j·s) entering into force on 20 may 2019 (world metrology day)., bipm (bureau international des poids et mesures) resolution of the 26th cgpm (16 november 2018), which fixed the planck constant and put the redefinition of the si kilogram into effect on 20 may 2019, bipm (bureau international des poids et mesures) resolution on the revised international system of units (si), effective 20 may 2019; nist 'a new era for the kilogram' (may 2019)., bipm (bureau international des poids et mesures) resolution on the revised si, effective 20 may 2019: https://www.bipm.org/en/measurement-units/rev-si/, bipm (bureau international des poids et mesures) resolution on the revised si, effective 20 may 2019; corroborated by nist's account of the kilogram redefinition based on the planck constant., bipm (bureau international des poids et mesures) resolution on the revised si, in force 20 may 2019, bipm (bureau international des poids et mesures) resolution on the revision of the si, and the nist 'international system of units (si)' reference, both stating the redefined kilogram took effect 20 may 2019., bipm (bureau international des poids et mesures) resolution on the revision of the si, effective 20 may 2019; corroborated by nist 'the kilogram is changing' publication., bipm (bureau international des poids et mesures) si brochure, 9th edition: the redefinition of the si base units, including the kilogram fixed via the planck constant, entered into force on 20 may 2019, following the 26th general conference on weights and measures (cgpm) resolution 1 adopted 16 november 2018, bipm (bureau international des poids et mesures), "on the revision of the si" / si brochure 9th edition — the kilogram, ampere, kelvin, and mole were redefined via fixed constants (planck constant h for the kilogram), effective 20 may 2019, following adoption at the 26th cgpm (nov 2018)., bipm (bureau international des poids et mesures), "the kilogram: si brochure" / resolution of the 26th cgpm (2018) - new si definitions took effect 20 may 2019; corroborated by nist, "redefining the kilogram" (physics.nist.gov), bipm (bureau international des poids et mesures), 'on the future revision of the si' / 2019 redefinition of si base units — the kilogram's definition based on 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 adopted 16 november 2018., bipm (bureau international des poids et mesures), 'on the revision of the si' / 26th cgpm resolution 1 (2018): the revised si, defining the kilogram via a fixed planck constant, took effect on 20 may 2019 (world metrology day), bipm (bureau international des poids et mesures), 'on the revision of the si' / 26th cgpm resolution 1 (2018); international system of units (si) redefinition effective 20 may 2019, bipm (bureau international des poids et mesures), 'si redefinition' / 26th cgpm resolution 1 (2018); entered into force 20 may 2019, bipm (bureau international des poids et mesures), 'the kilogram is defined by the planck constant, h' / resolution 1 of the 26th cgpm (2018), effective 20 may 2019 — https://www.bipm.org/en/measurement-units/si-base-units/kilogram, bipm (bureau international des poids et mesures), 'the kilogram is defined in terms of the planck constant' — resolution adopted at the 26th general conference on weights and measures (cgpm), entered into force on world metrology day, 20 may 2019 (https://www.bipm.org/en/measurement-units/si-base-units/kilogram), bipm (bureau international des poids et mesures), 'the kilogram' / si brochure 9th edition — the redefinition of the kilogram in terms of the planck constant took effect on 20 may 2019, bipm (bureau international des poids et mesures), 'the revised si', redefinition of the kilogram via the fixed value of the planck constant, entered into force on 20 may 2019 (world metrology day), bipm (bureau international des poids et mesures), 'the revision of the si, effective 20 may 2019' - https://www.bipm.org/en/measurement-units/rev-si/; and nist, 'the new si: new definition of the kilogram' - https://www.nist.gov/si-redefinition/kilogram-mass-metric-system-may-be-getting-shake, bipm (bureau international des poids et mesures), resolution on the revised si, and nist 'kilogram: the kibble balance' summary — both state the redefined si kilogram, fixed via the planck constant, took effect 20 may 2019., bipm (bureau international des poids et mesures), resolutions of the 26th cgpm (2018) on the revised si, effective 20 may 2019; corroborated by nist's public account of the 2019 redefinition of the kilogram in terms of the planck constant., bipm (bureau international des poids et mesures): the revised international system of units (si), redefining the kilogram in terms of the fixed value of the planck constant, entered into force on 20 may 2019 (world metrology day), following the 26th general conference on weights and measures (cgpm) resolution adopted 16 november 2018., bipm (international bureau of weights and measures), 'on the revision of the si' / resolution of the 26th cgpm (2018): the revised si came into force on 20 may 2019, defining the kilogram by fixing the planck constant h; corroborated by nist's 'kilogram: redefining the si base unit' publication describing the same 20 may 2019 effective date, bipm (international bureau of weights and measures), 'the kilogram is defined by taking the fixed numerical value of the planck constant h', revised si came into force on 20 may 2019, bipm (international bureau of weights and measures), 'the kilogram redefined' — si redefinition effective 20 may 2019; corroborated by nist 'kilogram: redefining the si base unit' (2019), bipm (international bureau of weights and measures), resolution of the 26th cgpm (2018): the revised si came into force on 20 may 2019, redefining the kilogram via a fixed numerical value of the planck constant, bipm (international bureau of weights and measures): the revised si, redefining the kilogram in terms of the planck constant h, was adopted by the 26th general conference on weights and measures (cgpm) on 16 november 2018 and entered into force on 20 may 2019 (world metrology day)., bipm / general conference on weights and measures (cgpm) resolution 1, 26th cgpm (nov 2018): the si redefinition fixing the planck constant took effect on world metrology day, 20 may 2019., bipm resolution 1 (2018), https://www.bipm.org/en/-/resolution-cgpm-26-1; corroborated by nist, https://www.nist.gov/si-redefinition, bipm resolution 1 of the 26th cgpm (2018), 'on the revision of the international system of units (si)', which redefined the kilogram via a fixed value of the planck constant, effective 20 may 2019 (world metrology day)., bipm resolution 1 of the 26th general conference on weights and measures (2018), and the international system of units (si) brochure, 9th edition — the redefined kilogram, based on a fixed value of the planck constant, took effect on 20 may 2019 (world metrology day), bipm resolution cgpm-26-1: https://www.bipm.org/en/-/resolution-cgpm-26-1, bipm, 'on the revision of the si' / 2018 cgpm resolution 1, and nist 'kilogram: redefining the si base unit' — both state the revised si, defining the kilogram via a fixed planck constant, took effect on 20 may 2019, bipm, 'the international system of units (si brochure), 9th edition' (2019) — the revised si, redefining the kilogram via a fixed planck constant, took effect on world metrology day, 20 may 2019., bipm, 'the international system of units (si)', 9th edition (2019): the kilogram redefinition based on planck constant h took effect 20 may 2019, bipm, 'the international system of units (si)', 9th edition (2019): the revised si, redefining the kilogram in terms of the planck constant, entered into force on 20 may 2019, bipm, 'the international system of units (si)', 9th edition (2019); resolution adopted at the 26th general conference on weights and measures (november 2018) redefining the kilogram via the planck constant, effective 20 may 2019 (world metrology day), bipm, 'the international system of units (si)', 9th edition; 26th cgpm resolution 1 (2018), redefinitions entered into force on 20 may 2019 (world metrology day), bipm, 'the international system of units (si), 9th edition (2019)' and the 26th cgpm resolution 1 (2018), which fixed the planck constant h = 6.62607015e-34 j s, redefining the kilogram effective 20 may 2019 (world metrology day), bipm, 'the international system of units (si), 9th edition' (2019); the revised si redefining the kilogram via the planck constant took effect 20 may 2019., bipm, 'the kilogram is now defined by the planck constant' (https://www.bipm.org/en/-/2019-05-20-kilogram-e) and nist, 'the new kilogram: how the world's mass standard has changed' — both state the revised si definitions based on fixed fundamental constants, including the planck constant for the kilogram, entered into force on 20 may 2019, bipm, 'the kilogram is now defined by the planck constant' / si brochure 9th edition: revised si took effect on 20 may 2019, https://www.bipm.org/en/measurement-units/si-base-units, bipm, 'the kilogram, symbol kg' (si brochure, 9th ed.) — new si definitions based on fixed fundamental constants, including planck's constant for the kilogram, took effect on 20 may 2019., bipm, 'the kilogram: astonishing accuracy results from planck's constant' (bipm.org, si brochure 9th edition) - the redefined si took effect 20 may 2019, bipm, 'the kilogram: definition' (si brochure, 9th edition) - the revised si came into force on 20 may 2019, redefining the kilogram in terms of the fixed value of the planck constant, bipm, 'the kilogram: definition' / 26th cgpm (2018) resolution 1 on the revised si, which redefined the kilogram in terms of a fixed value of the planck constant (h), taking effect on world metrology day, 20 may 2019, bipm, 'the kilogram: the new international system of units (si)' (bipm.org) and nist 'kilogram: redefining the si base unit' — both state the redefined kilogram, fixed via the planck constant h = 6.62607015e-34 j*s, entered into force on 20 may 2019, following adoption by the 26th cgpm on 16 november 2018., bipm, resolution 1 of the 26th cgpm (2018), 'on the revision of the international system of units (si)' — the redefinition of the kilogram in terms of the fixed value of the planck constant took effect on 20 may 2019, world metrology day., bipm, resolution-cgpm-26-1 (https://www.bipm.org/en/-/resolution-cgpm-26-1), corroborated by nist, si redefinition (https://www.nist.gov/si-redefinition)., bipm/si brochure: the revised si took effect on 20 may 2019, redefining the kilogram via a fixed value of the planck constant (h = 6.62607015e-34 j s)., en.wikipedia.org, www.bipm.org
Work
- pinnedblocks 26,087,454 to 26,087,754 to · on Ethereum mainnet
- answered222 of 222 agreed210 needed
#17232,019from www.nist.gov
#6842,019from en.wikipedia.org
#6162,019from www.bipm.org
#10842,019from www.bipm.org
#5032,019from www.bipm.org217 more
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