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Heat transfer takes place due to collision in atoms (of which everything around us is mad). In solids these atoms are near to each other but in gas atoms are very very far from each other.

So in case of solids, it is easier to transfer the heat in form of collisions but in air it is difficult to transfer these collisions.

Note: Heat is transferred in form of collisions because heat increases speed of atoms. This speed when transferred to adjacent atoms by collisions, transfers the heat.

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12y ago

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