Question

how does a thermos flask keep liquids hot or cold

Answer 1

Answer:

because it ia vaccum  and it is also a good insulator.

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Explanation:

Answer 2

$\bf\huge\underline\mathtt\purple{Question}$

How does a thermos flask keep liquids hot or cold?

$\bf\huge\underline\mathtt\pink{Answer}$

It is a double-walled vessel in which the inner surface of the outer vessel and the outer surface of the inner vessel are silvered so as to prevent radiation of heat. The space between the walls of the two vessels is made of vacuum to prevent the escape of heat by conduction or convection.