Question

d) How does a thermos flask prevent the loss of heat?
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Answer 1

Answer:

If heat can't escape from a vacuum flask, it follows that heat can't penetrate into a flask from outside either. The sealed stopper stops heat getting in by convection; the vacuum stops conduction, and the metal lining between the outer case and the inner chamber stops heat radiating in either.

Explanation:

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Answer 2

Answer:

function of the thermos flask is to prevent the flow of heat to and from the bottle

Explanation:

since there is vaccum between the walls of the bottle flow of heat by convection is also ruled out. due to silvering of the walls hest is not lost by radiation