Mon May 21, 2012 By: Jigyasa Dwivedi

why metallic conductance decreases with increase in temperature whereas electrolytic conductance increases with increase in temperature ?

Expert Reply
Tue May 22, 2012
The reason for this very behaviour of metals is explained by the fact that at random, the free electrons moving in a metallic object also collide with the atoms contained in the wire. Due to these collisions, their kinetic energy is wasted to some extent. 
When the temperature of such a metallic wire is increased, their collisions with the containing atoms become more frequent and ultimately more energy is wasted. This obviously reduce their thermal and electrical conductivity.
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