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We know, in gases the molecules are very loosely packed.The separation between the particles in gases are very large as compared to their size.
As a result their is no attractive repulsive forces between the molecules.
Therefore, they cannot transfer heat and the conduction is not possible by gases.
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It is actually done(refer to convection), it is just that gases are bad conductors of heat. this is cuz the molecules in gases are very far apart(by definition) and heat transfer is done thru molecular collision. since the molecs are far apart, when the gas comes into contact with another substance, the collision frequency is low, therefore its a bad conductor
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