IUPAC-IUGS common definition and convention on the use of the year as a derived unit of time (IUPAC Recommendations 2011)

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...

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Bibliographic Details
Published in:Pure and applied chemistry 2011-04, Vol.83 (5), p.1159-1162
Main Authors: Holden, Norman E., Bonardi, Mauro L., De Bièvre, Paul, Renne, Paul R., Villa, Igor M.
Format: Article
Language:English
Subjects:
Abandonment
annus
BNL
COMPLIANCE
decay constants
geochronology
GEOSCIENCES
IUPAC Analytical Chemistry Division
IUPAC Inorganic Chemistry Division
NUCLEAR CHEMISTRY
Organic chemistry
SI units
units of time
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Summary: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 × 10 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.
ISSN:0033-4545
1365-3075
DOI:10.1351/PAC-REC-09-01-22