Planck constant: Difference between revisions

Revision as of 18:17, 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) is:

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

Js

More recent measurements place a preliminary value at $6.62607095(44)\times 10^{-34}$ Js (Ref. 1)

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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]) is:
+:<math> 6.626 068 96(33)\times 10^{-34}</math> Js
+More recent measurements place a preliminary value at <math>  6.626 070 95(44)\times 10^{-34}</math> Js (Ref. 1)
+==References==
+#[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)]
-:<math>6.626 0693(11) \times 10^{-34}</math> Js
 [[Category: Physical constants]]