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Thermal conductivity of air is less than...

Thermal conductivity of air is less than that of felt but felt is a better heat insulator in comparison to air. Why ?

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Felt contains fine holes in which air is trapped. This air trapped is not free to move in these holes. So convection is not possible. Besides this as felt is a bad conductor, conduction is also not possible. Like this felt is better insulator in comparison to air.
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