Air is a bad conductor of heat or partly conducts heat, still, the vacuum is to be placed between the walls of the thermos flask because

Question

Air is a bad conductor of heat or partly conducts heat, still, the vacuum is to be placed between the walls of the thermos flask because, it is difficult to fill the air between the walls of thermos flask, due to more pressure of air, the thermos can get crack, by convection, heat can flow through air, on filling the air, there is no advantage

MARKS App · Accepted Answer

No flow of heat by convection in vacuum. As convection requires medium particle to propogate.

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