Question

With increases in temperature thermal conductivity of aluminium increases

Answer 1

But in case of pure metal , it happens that as temperature increases its thermal conductivity decreases. But aluminium is always available in oxide form, so its thermal conductivity increases. WIEDMANN FRANZ LAW: it states that the thermal conductivity of material is directly proportional to electrical conductivity.

Answer 2

Hi mate here is ur query
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As Aluminium is a conductor with increasing temperature the vibration increases in molecular atom which obstract the electronic path as a result the conductivity of aluminium will decrease.

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Hope this will help you