10. On which phenomenon thermos flask works?
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The technical name of a thermos is a vacuum flask (you will know the reason why, shortly). To keep your drinks hot or cold, it minimizes heat transfer due to conduction and radiation. Convection is not included because convection keeps the temperature in a liquid even.
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The phenomenon in which Thermos flask work is convection, conduction and radiation
Explanation:
This is because of the following reason as glass bottle is used to low rate of conduction as glass is very good insulator .
The space between the walls is evacuated with the help of a vacuum pump and salad.
this rules out the flow of heat by convection.
Radiation as the thermos is silver and shiny and reflect heat
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