Air is a bad conductor of heat or partly cond | vedclass

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Question

(C) The primary purpose of a thermos flask is to minimize heat transfer between the contents and the surroundings. Heat transfer occurs via conduction

Vedclass · Accepted Answer

Heat can flow through air by convection.

Vedclass · Answer

(C) The primary purpose of a thermos flask is to minimize heat transfer between the contents and the surroundings. Heat transfer occurs via conduction,convection,and radiation. While air is a poor conductor of heat,it allows heat transfer through convection currents. By creating a vacuum between the walls,convection is completely eliminated,as convection requires a material medium to transport heat. Therefore,the correct answer is $C$.

Air is a bad conductor of heat or partly conducts heat,yet a vacuum is placed between the walls of a thermos flask because:

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