A thermos flask (or vacuum flask) is designed to minimize heat transfer by all three primary modes: conduction, convection, and radiation. The vacuum between the inner and outer walls prevents heat transfer by conduction and convection. The silvered surfaces of the walls reflect thermal radiation, reducing heat loss or gain by radiation.
A liquid remains hot or cold for a long time in a thermos flask because there is no loss or gain of heat by
Asked in UPPCS Prelims 2019 · Topic: Heat and Thermodynamics (Modes of Heat Transfer (Conduction, Convection, Radiation))
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