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Question

When vapour condenses into a liquid:


A
It absorbs heat
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B
It liberates heat
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C
Its temperature increases
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D
Its temperature decreases
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Solution

The correct option is B It liberates heat
During the phase transition, heat is liberated if the vapour is converted into the liquid. Amount of heat liberated Q depends upon the mass of vapour (m) and the latent heat of vaporization (L). The same amount of heat has to be supplied to convert a liquid with mass (m) to vapour.

Amount of heat released Q = mL

But, the temperature remains the same during the phase transition.

Physics

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