Drinks remain hot or cold for a long time in a thermos flask because o – McqOptions

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1.	Drinks remain hot or cold for a long time in a thermos flask because of the
A.	vacuum between the double walls
B.	presence of air, which is a bad conductor of heat, in between the double walls
C.	silver coating on the inside of the double walls
D.	combine effects of (b) and (c)
Answer» E.

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