Academic Journal
Understanding the role of defining constants within the SI.
| Τίτλος: | Understanding the role of defining constants within the SI. |
|---|---|
| Συγγραφείς: | Rab, Shanay, Brown, Richard J C, Mari, Luca |
| Πηγή: | Measurement Science & Technology; 2026, Vol. 37 Issue 37, p1-12, 12p |
| Θεματικοί όροι: | Physical constants, Metrology, Metric system, Units of measurement |
| Περίληψη: | The 2019 redefinition of the International System of Units (SI) is often described as a historic transition from unit definitions based on artefacts or physical phenomena to a system underpinned by fundamental constants of nature. The current SI defines the SI base units, and from them all SI units, in terms of defining constants: these provide the basis for stable and comparable measurement. Accounts of the recent history of the SI often discuss the transition to the use of defining constants but rarely seek to investigate the concept 'defining constant' as such. This review article revisits the evolution of the role of defining constants in the SI, by examining its philosophical and practical implications in metrology for the purposes of unit definition and investigating the different ways in which SI units can be said to depend on defining constants. It also highlights the ongoing discussions surrounding the physical significance and interpretational nuances of defining constants within the framework of the SI and the choices that were made during the 2019 revision of the SI. [ABSTRACT FROM AUTHOR] |
| Copyright of Measurement Science & Technology is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Βάση Δεδομένων: | Complementary Index |
| FullText | Text: Availability: 0 |
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| Header | DbId: edb DbLabel: Complementary Index An: 197036732 RelevancyScore: 1082 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 1082.42785644531 |
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| Items | – Name: Title Label: Title Group: Ti Data: Understanding the role of defining constants within the SI. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Rab%2C+Shanay%22">Rab, Shanay</searchLink><br /><searchLink fieldCode="AR" term="%22Brown%2C+Richard+J+C%22">Brown, Richard J C</searchLink><br /><searchLink fieldCode="AR" term="%22Mari%2C+Luca%22">Mari, Luca</searchLink> – Name: TitleSource Label: Source Group: Src Data: Measurement Science & Technology; 2026, Vol. 37 Issue 37, p1-12, 12p – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Physical+constants%22">Physical constants</searchLink><br /><searchLink fieldCode="DE" term="%22Metrology%22">Metrology</searchLink><br /><searchLink fieldCode="DE" term="%22Metric+system%22">Metric system</searchLink><br /><searchLink fieldCode="DE" term="%22Units+of+measurement%22">Units of measurement</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The 2019 redefinition of the International System of Units (SI) is often described as a historic transition from unit definitions based on artefacts or physical phenomena to a system underpinned by fundamental constants of nature. The current SI defines the SI base units, and from them all SI units, in terms of defining constants: these provide the basis for stable and comparable measurement. Accounts of the recent history of the SI often discuss the transition to the use of defining constants but rarely seek to investigate the concept 'defining constant' as such. This review article revisits the evolution of the role of defining constants in the SI, by examining its philosophical and practical implications in metrology for the purposes of unit definition and investigating the different ways in which SI units can be said to depend on defining constants. It also highlights the ongoing discussions surrounding the physical significance and interpretational nuances of defining constants within the framework of the SI and the choices that were made during the 2019 revision of the SI. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of Measurement Science & Technology is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1088/1361-6501/aea018 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 1 Subjects: – SubjectFull: Physical constants Type: general – SubjectFull: Metrology Type: general – SubjectFull: Metric system Type: general – SubjectFull: Units of measurement Type: general Titles: – TitleFull: Understanding the role of defining constants within the SI. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Rab, Shanay – PersonEntity: Name: NameFull: Brown, Richard J C – PersonEntity: Name: NameFull: Mari, Luca IsPartOfRelationships: – BibEntity: Dates: – D: 18 M: 09 Text: 2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 09570233 Numbering: – Type: volume Value: 37 – Type: issue Value: 37 Titles: – TitleFull: Measurement Science & Technology Type: main |
| ResultId | 1 |