Question

explain the working of thermas flast​

Answer 1

Answer:

A vacuum flask, or thermos, does not allow heat transfer by any of the three ways that heat can travel. The silver coating on the inner bottle prevents heat transfer by radiation, and the vacuum between its double wall prevents heat moving by convection. ... The case surrounding the flask provides additional insulation.

Answer 2

The vacuum prevents conduction. The tight stopper prevents in air from entering or leaving the flask, so convection isn't possible either.

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.

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