How does the temperature of a liquid in a thermos flask remains same for a long time?
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A flask or a thermos keeps hot liquids hot and cold liquids cold. ... The basic principle behind the working of a flask is to insulate the substance from the outside air so that no heat transfer takes place. When there is no heat transfer, the temperature of the substance remains the same
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because the glass used in the thermos flask is inpermeable for temperature it means the internal heat will not go outside and external heat will also not come inside that's why the liquid in a thermos will be of the same temperature for a long time.
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