Talk:Wiedemann-Franz law

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The following paragraph in the article is identical to text from the [Hyperphysics web page][1]:

Qualitatively, this relationship is based upon the fact that the heat and electrical transport both involve the free electrons in the metal. The thermal conductivity increases with the average particle velocity since this increases the forward transport of energy. The electrical conductivity, on the other hand, decreases while particle velocity increases because the collisions divert the electrons from forward transport of charge.

I don't know who copied who or whether Hyperphysics gave permission for Wikipedia to use the text. Is this copyright infringement?

--DelusionOfGrandeur 21:39, 17 May 2007 (UTC)