Given below are the components of a vacuum flask. Explain how they help in maintaining the temperature of the liquid inside the flask [3]
(i) Vacuum.
(ii) Cork
(iii) Shining surface
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Hint: A vacuum flask or thermos flask is designed so that any means of conduction or radiation will not allow heat loss. The vacuum prevents conduction heat loss because the vacuum is a bad heat conductor. Because it is tightly sealed, the stopper prevents heat loss through convection.
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A vacuum flask or thermos flask is designed so that any means of conduction or radiation will not allow heat loss. The vacuum prevents conduction heat loss because the vacuum is a bad heat conductor.
Because it is tightly sealed, the stopper prevents heat loss through convection.
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