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Q.

Is it true that the thermos is a device used for keeping hot things hot and cold things cold?


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a

True

b

False  

answer is A.

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Detailed Solution

The  above statement is True.
A thermos keeps cold things cold in the same way. It does not contain any cooling equipment. The same vacuum that keeps hot things hot keeps cold things cold. The heat that might otherwise be transferred to the cold contents of the thermos does not reach it because of the vacuum between the walls of the thermos.
 
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