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Question
A thermos flask prevents loss or gain of heat by
(a) conduction only
(b) convection only
(c) radiation only
(d) all of the above
(a) conduction only
(b) convection only
(c) radiation only
(d) all of the above
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Solution
(d) all of the above
The empty space between the two glass walls prevent the loss of heat through conduction and convection, as both of these processes need a medium to transfer heat. Also, the silvery wall of flask reflects back the heat and prevents its loss through radiation.
The empty space between the two glass walls prevent the loss of heat through conduction and convection, as both of these processes need a medium to transfer heat. Also, the silvery wall of flask reflects back the heat and prevents its loss through radiation.
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