IUPAC-IUGS common definition and convention on the use of the year as a derived unit of time (IUPAC Recommendations 2011)
- Holden, Norman E. 1International Union of Pure and Applied Chemistry
- Bonardi, Mauro L. 1International Union of Pure and Applied Chemistry
- De Bièvre, Paul 4Consultant on Metrology in Chemistry, Duineneind 9, B-2460 Kasterlee, Belgium
- Renne, Paul R. 5Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94720, USA
- Villa, Igor M. 8Institut für Geologie, Universität Bern, CH-3012 Bern, Switzerland
Published in:
- Pure and Applied Chemistry. - Walter de Gruyter GmbH. - 2011, vol. 83, no. 5, p. 1159-1162
English
The units of time (both absolute time and duration) most practical to use when dealing with very long times, for example, in nuclear chemistry and earth and planetary sciences, are multiples of the year, or annus (a). Its proposed definition in terms of the SI base unit for time, the second (s), for the epoch 2000.0 is 1 a = 3.1556925445 × 107 s. Adoption of this definition, and abandonment of the use of distinct units for time differences, will bring the earth and planetary sciences into compliance with quantity calculus for SI and non-SI units of time.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1351/pac-rec-09-01-22
- ISSN 1365-3075
- Persistent URL
- https://sonar.ch/global/documents/60225
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