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  4. 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

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Q. 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

NTA AbhyasNTA Abhyas 2020Thermal Properties of Matter

Solution:

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