2019 redefinition of the SI base units
Effective 20 May 2019, the 144th anniversary of the Metre Convention, the SI base units were redefined in agreement with the International System of Quantities. In the redefinition, four of the seven SI base units – the kilogram, ampere, kelvin, and mole – were redefined by setting exact numerical values when expressed in SI units for the Planck constant (h), the elementary electric charge (e), the Boltzmann constant (kB), and the Avogadro constant (NA), respectively. The second, metre, and candela were already defined by physical constants and were not subject to correction to their definitions. The new definitions aimed to improve the SI without changing the value of any units, ensuring continuity with existing measurements. In November 2018, the 26th General Conference on Weights and Me
2019 International System of Units2019 Le Système International d'Unités2019 SI2019 SI redefinition2019 redefinition of SI base units2019 redefinition of the SI unitsInternational System of Units (2019)International System of Units 2019Le Système International d'Unités (2019)Le Système International d'Unités 2019New SINew SI definitionsProposed redefinition of SI base unitsQuantum SI SystemQuantum SI systemRedefinition of SI base unitsRedefinition of the SI base unitsSI (2019)SI 2019
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2019 redefinition of the SI base units
Effective 20 May 2019, the 144th anniversary of the Metre Convention, the SI base units were redefined in agreement with the International System of Quantities. In the redefinition, four of the seven SI base units – the kilogram, ampere, kelvin, and mole – were redefined by setting exact numerical values when expressed in SI units for the Planck constant (h), the elementary electric charge (e), the Boltzmann constant (kB), and the Avogadro constant (NA), respectively. The second, metre, and candela were already defined by physical constants and were not subject to correction to their definitions. The new definitions aimed to improve the SI without changing the value of any units, ensuring continuity with existing measurements. In November 2018, the 26th General Conference on Weights and Me
has abstract
Effective 20 May 2019, the 144 ...... le, and the Avogadro constant.
@en
Em 16 de novembro de 2018, a 2 ...... da constante de Avogadro (NA).
@pt
Mezinárodní výbor pro míry a v ...... , molu a Avogadrovy konstanty.
@cs
Pada tahun 2019, satuan pokok ...... , serta konstanta Avogadro NA.
@in
Un sous-comité du Comité inter ...... rée en vigueur le 20 mai 2019.
@fr
Una comisión Comité Internacio ...... amperio, el kelvin y el mol.
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В 2019 году вступили в силу из ...... по мерам и весам в 2018 году.
@ru
Зміни визначень основних одини ...... нцією з мір і ваг у 2018 році.
@uk
في 16 نوفمبر 2018، صوتت اللجنة ...... كيلوغرام، ومول وثابت أفرجادور.
@ar
国際度量衡委員会 (CIPM) の委員会は、SI基本単位の定 ...... (SI) 9th edition 2019）を基にしている。
@ja
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Effective 20 May 2019, the 144 ...... l Conference on Weights and Me
@en
Em 16 de novembro de 2018, a 2 ...... mo em suas câmaras seladas. As
@pt
Mezinárodní výbor pro míry a v ...... imální dosažitelnou přesností.
@cs
Pada tahun 2019, satuan pokok ...... uran dan Timbangan (CGPM) ke-2
@in
Un sous-comité du Comité inter ...... té votées lors de la 26e CGPM.
@fr
Una comisión Comité Internacio ...... o Folleto de unidades del SI.
@es
В 2019 году вступили в силу из ...... по мерам и весам в 2018 году.
@ru
Зміни визначень основних одини ...... нцією з мір і ваг у 2018 році.
@uk
في 16 نوفمبر 2018، صوتت اللجنة ...... هر الطبيعية.يمكن تلخيص المقترح
@ar
国際度量衡委員会 (CIPM) の委員会は、SI基本単位の定 ...... (SI) 9th edition 2019）を基にしている。
@ja
label
2019 redefinition of the SI base units
@en
2019年國際單位制基本單位重新定義
@zh
Nové definice SI
@cs
Redefinición de las unidades del SI
@es
Redefinisi satuan pokok SI 2019
@in
Redefinição das unidades do SI
@pt
Redéfinition du Système international d'unités de 2018-2019
@fr
SI基本単位の再定義 (2019年)
@ja
Зміни визначень основних одиниць (SI)
@uk
Изменения определений основных единиц СИ (2019)
@ru