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| The '''Planck constant''' (<math>h</math>), is named after the German physicist [[Max Karl Ernst Ludwig Planck]]. | | The '''Planck constant''' (<math>h</math>),is named after the German physicist [[Max Karl Ernst Ludwig Planck]]. |
| Its value (in SI units, 2006 [http://www.codata.org/ CODATA] (Ref. 1)) is: | | Its value (in SI units, 2002 [http://www.codata.org/ CODATA]) is: |
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| :<math> 6.626 068 96(33)\times 10^{-34} ~\mathrm{Js}</math> | | :<math>6.626 0693(11) \times 10^{-34}</math> Js |
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| More recent measurements place a preliminary value at <math> 6.626 070 95(44)\times 10^{-34}~\mathrm{Js}</math> (Ref. 2)
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| ==References==
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| #[http://dx.doi.org/10.1103/RevModPhys.80.633 Peter J. Mohr, Barry N. Taylor, and David B. Newell "CODATA recommended values of the fundamental physical constants: 2006", Reviews of Modern Physics '''80''' 633 (2008)]
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| #[http://dx.doi.org/10.1088/0026-1394/44/6/001 I A Robinson and B P Kibble "An initial measurement of Planck's constant using the NPL Mark II watt balance", Metrologia '''44''' pp. 427-440 (2007)]
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| [[Category: Physical constants]] | | [[Category: Physical constants]] |