Jump to ContentJump to Main Navigation

Pure and Applied Chemistry

The Scientific Journal of IUPAC

Ed. by Burrows, Hugh / Weir, Ron / Stohner, Jürgen

12 Issues per year


IMPACT FACTOR 2014: 2.492
5-year IMPACT FACTOR: 3.202
Rank 51 out of 157 in category Chemistry, Multidisciplinary in the 2014 Thomson Reuters Journal Citation Report/Science Edition

SCImago Journal Rank (SJR): 1.172
Source Normalized Impact per Paper (SNIP): 1.106

VolumeIssuePage

Issues

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

Norman E. Holden1 / Mauro L. Bonardi1 / Paul De Bièvre4 / Paul R. Renne5 / Igor M. Villa8

1International Union of Pure and Applied Chemistry

2National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973, USA

3LASA, Università degli Studi di Milano and INFN, I-20090 Segrate, Italy

4Consultant on Metrology in Chemistry, Duineneind 9, B-2460 Kasterlee, Belgium

5Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94720, USA

6Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA

7International Union of Geological Sciences

8Institut für Geologie, Universität Bern, CH-3012 Bern, Switzerland

9Università di Milano Bicocca, I-20126 Milano, Italy

Project Year: 2006, Project Code: 2006-016-1-200

Citation Information: Pure and Applied Chemistry. Volume 83, Issue 5, Pages 1159–1162, ISSN (Online) 1365-3075, ISSN (Print) 0033-4545, DOI: 10.1351/PAC-REC-09-01-22, April 2011

Publication History

Published Online:
2011-04-08

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.

Keywords: annus; decay constants; geochronology; IUPAC Analytical Chemistry Division; IUPAC Inorganic Chemistry Division; SI units; units of time

References

  • 1

    IUPAC. Quantities, Units and Symbols in Physical Chemistry, 3rd ed. (the “Green Book”). Prepared for publication by E. R. Cohen, T. Cvitaš, J. G. Frey, B. Holmström, K. Kuchitsu, R. Marquardt, I. Mills, F. Pavese, M. Quack, J. Stohner, H. L. Strauss, M. Takami, A. J. Thor, p. 137, RSC Publishing, Cambridge, UK (2007).

  • 2

    IUPAP. Symbols, Units and Nomenclature and Fundamental Constants in Physics, <http://metrology.wordpress.com/measurement-process-index/iupap-red-book/>.

  • 3

    Recommendations concerning Units. Reprinted from the “IAU Style Manual” by G. A. Wilkinson, Comm. 5, in IAU Transactions XXB (1987). <http://www.iau.org/science/publications/proceedings_rules/units/>.

  • 4

    A. Thompson, B. N. Taylor. Special Publication 811: Guide for the Use of the International System of Units (SI), National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA (2008).

  • 5

    BIPM. Le Système international d’unités – The International System of Units SI, 8th ed., Bureau International des Poids et Mesures, Geneva (2006). <http://www.bipm.fr/fr/si/si_brochure/>.

  • 6

    The 11th General Conference on Weights and Measures (GGPM), Resolution 9; CR 86 (1960).

Citing Articles

Here you can find all Crossref-listed publications in which this article is cited. If you would like to receive automatic email messages as soon as this article is cited in other publications, simply activate the “Citation Alert” on the top of this page.

[1]
K. Krohn, R. Jaumann, D. Elbeshausen, T. Kneissl, N. Schmedemann, R. Wagner, J. Voigt, K. Otto, K.D. Matz, F. Preusker, T. Roatsch, K. Stephan, C.A. Raymond, and C.T. Russell
Planetary and Space Science, 2014, Volume 103, Page 36
[2]
B. Pfeiffer, K. Venkataramaniah, U. Czok, and C. Scheidenberger
Atomic Data and Nuclear Data Tables, 2014, Volume 100, Number 2, Page 403

Comments (0)

Please log in or register to comment.