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¦Ë1/¦Ò=LT, where L is the Lorenz number(ÂåÂ××ÈϵÊý) and T is the absolute temperature.
Free electron model suggests that L should be constant for all metals and approach Summerfeld Lorenz constant L0 (= 2.44¡Á10-8 V2•K-2 )
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