Inside the case of a thermos flask is a double - walled glass vessel.The space between the wall is evacuated .Can you guess why?
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The space between the two double layers has been evacuated so as to create a vacuum.
This is quite important as the vacuum prevents heat loss or gain from the thermos flask by the process of radiation. This is one of the three methods that the thermos flask employs to keep the liquid content in it hot or cold.
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The other two methods that are used to prevent heat loss or gain by the thermos flask is by:
i) Use of a plastic casing and cap - this helps prevent heat loss or gain by conduction of heat
ii) Use of silver coat on the flask - this helps prevent the heat gain or loss from the thermos flask through radiation.
This is quite important as the vacuum prevents heat loss or gain from the thermos flask by the process of radiation. This is one of the three methods that the thermos flask employs to keep the liquid content in it hot or cold.
-----------------------------------------------------------------------------------------------------------------
The other two methods that are used to prevent heat loss or gain by the thermos flask is by:
i) Use of a plastic casing and cap - this helps prevent heat loss or gain by conduction of heat
ii) Use of silver coat on the flask - this helps prevent the heat gain or loss from the thermos flask through radiation.
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