Question

6. A thermos flask keeps a liquid hot by preventing heat loss through
(a) conduction. (b) convection. (c) radiation. (d) all of these​

Answer 1

Answer:

d) all of these

Explanation:

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 thinness of the glass walls stops heat entering or leaving the flask by conduction.

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Answer 2

d) all of these

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