A Thermos flask has two walls with a vacuum between them. How does this help in keeping tea or milk hot?...Give youe own answer,I will make you as Brainliest
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Answer:
These few, simple features prevent virtually all heat transfer by either conduction, convection, or radiation. The vacuum prevents conduction. The tight stopper prevents air from entering or leaving the flask, so convection isn't possible either. What about radiation? When infrared radiation tries to leave the hot liquid, the reflective lining of the inner chamber reflects it straight back in again. There's virtually no way heat can escape from a vacuum flask and a hot drink stored inside will stay steaming hot for several hours.
Because a thermos flask works by restricting the transfer of heat (energy) to and away from the contents. The inner tube is isolated from the external case by a vacuum. This prevents the transfer of energy, say heat, into the inner chamber where there is a cold beverage.