Thermoflasks and doors of refrigerators have two-layered structure with an insulator in between so as:
To allow more heat to pass through it
Not to let heat flow through it
To make it stronger
To beautify it
A
To make it stronger
B
To beautify it
C
To allow more heat to pass through it
D
Not to let heat flow through it
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Solution
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An insulator between the two layers prevents heat exchange.
Some materials do not allow the heat to flow through them, and they are known as bad heat conductors or heat insulators, the insulators are poor heat conductors, the poor conductors are good insulators and they are materials that the heat cannot move through them.
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