explain the construction and working of a thermos flask?
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It is constructed in such a way that heat loss due to conduction,convection and radiation is minimized. It is a double walled bottle of thin glass and the space between the walls is evacuated. The mouth of the bottle is closed by a cork or plastic stopper.
A thermos is a bottle with a double-walled container inside of it. The air between the two walls is sucked out during construction, creating a vacuum. Instead of containing some kind of heating element to keep hot things hot, a thermos is designed to keep hot things hot by not allowing heat to escape.
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