Difference between revisions of "CODATA Recommended Values of the Fundamental Physical Constants"
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| − | The '''CODATA Recommended Values of the Fundamental Physical Constants''' are a set of mutually consistent values for selected [[physical constant]]s, calculated under the auspices of the [[CODATA]] Task Group on Fundamental Constants. Since 1998, calculations have been carried out every four years by the U.S. [[National Institute for Standards and Technology]] (NIST), and the values are diffused via the NIST website as well as by publication in the printed scientific literature. The most current set is the " | + | The '''CODATA Recommended Values of the Fundamental Physical Constants''' are a set of mutually consistent values for selected [[physical constant]]s, calculated under the auspices of the [[CODATA]] Task Group on Fundamental Constants. Since 1998, calculations have been carried out every four years by the U.S. [[National Institute for Standards and Technology]] (NIST), and the values are diffused via the NIST website as well as by publication in the printed scientific literature. The most current set is the "2010 recommended values", which takes account of all measurements up to 31 December 2010: the values were available online from June 2011.<ref>{{CODATA 2010}}.</ref> |
The calculation is a [[least squares]] adjustment of the experimental values to obtain a self-consistent set. The input values are weighted according to their relative [[Measurement uncertainty|measurement uncertainties]] (''w'' = 1/''u''{{su|p=2|b=r}}), so that more precise values have a higher effect on the final result than less precise experiments. | The calculation is a [[least squares]] adjustment of the experimental values to obtain a self-consistent set. The input values are weighted according to their relative [[Measurement uncertainty|measurement uncertainties]] (''w'' = 1/''u''{{su|p=2|b=r}}), so that more precise values have a higher effect on the final result than less precise experiments. | ||
Latest revision as of 07:15, 3 June 2011
The CODATA Recommended Values of the Fundamental Physical Constants are a set of mutually consistent values for selected physical constants, calculated under the auspices of the CODATA Task Group on Fundamental Constants. Since 1998, calculations have been carried out every four years by the U.S. National Institute for Standards and Technology (NIST), and the values are diffused via the NIST website as well as by publication in the printed scientific literature. The most current set is the "2010 recommended values", which takes account of all measurements up to 31 December 2010: the values were available online from June 2011.[1]
The calculation is a least squares adjustment of the experimental values to obtain a self-consistent set. The input values are weighted according to their relative measurement uncertainties (w = 1/u2r), so that more precise values have a higher effect on the final result than less precise experiments.
History
The first analysis of the values of physical constants was carried out by Birge in the late 1920s.[2][3]
Data pages
- CODATA Recommended Values of the Fundamental Physical Constants 1973
- CODATA Recommended Values of the Fundamental Physical Constants 1986
- CODATA Recommended Values of the Fundamental Physical Constants 1998
- CODATA Recommended Values of the Fundamental Physical Constants 2002
- CODATA Recommended Values of the Fundamental Physical Constants 2006
- CODATA Recommended Values of the Fundamental Physical Constants 2010
Notes and references
Notes
References
- ↑ CODATA Recommended Values of the Fundamental Physical Constants, <http://physics.nist.gov/cuu/Constants/index.html>, NIST Reference of Constants, Units, and Uncertainty; National Institute for Standards and Technology.
- ↑ Birge, Raymond T. Probable Values of the General Physical Constants. Rev. Mod. Phys. 1929, 1 (1), 1–73. DOI: 10.1103/RevModPhys.1.1.
- ↑ Birge, R. T. Nuovo Cimento, Suppl. 1957, 6 (1), 39–67.
External links
- NIST Reference on Constants, Units, and Uncertainty, with current recommended values
- Official site of the CODATA Task Group on Fundamental Constants
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