Planck constant: Difference between revisions

Latest revision as of 17:30, 20 August 2008

The Planck constant ( $h$ ), is named after the German physicist Max Karl Ernst Ludwig Planck. Its value (in SI units, 2006 CODATA (Ref. 1)) is:

6.62606896(33)\times 10^{-34}~\mathrm {Js}

More recent measurements place a preliminary value at $6.62607095(44)\times 10^{-34}~\mathrm {Js}$ (Ref. 2)

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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, 2002 [http://www.codata.org/ CODATA]) is:
+Its  value (in SI units, 2006 [http://www.codata.org/ CODATA] (Ref. 1)) is:
-:<math>6.626 0693(11) \times 10^{-34}</math> Js
+:<math> 6.626 068 96(33)\times 10^{-34} ~\mathrm{Js}</math>
+More recent measurements place a preliminary value at <math>  6.626 070 95(44)\times 10^{-34}~\mathrm{Js}</math> (Ref. 2)
+==References==
+#[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)]
+#[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)]
 [[Category: Physical constants]]