Metals are good conductors of heat because they-

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NPCIL SA/ST ME GJ Held on 08/11/2019, Shift-1

Answer 1

Concept:

The thermal conductivity of the liquids is more than the gasses and the metals have the highest.
Metals have valence electrons that are free to move around the surface. When heated, these free electrons collide with each other and the majority of the Kinetic energy is transformed into heat energy, making metals a good conductor of heat.
In the gaseous state, the molecules of a substance are spaced relatively far away, and their motion is random. This means that energy transfer by the molecular impact is much slower than in the case of a liquid, in which the motion is still random but in liquids, the molecules are more closely packed. The same is true concerning the difference between the thermal conductivity of the liquid and solid phases.