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Latent Heat of Vaporisation

A swimmer com...

Question

A swimmer coming out of a pool is covered with a film of water weighing about $80 g$ . How much heat must be supplied to evaporate this water?

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Solution

Latent heat of vaporization is defined as the amount of energy required to change state from liquid to vapor state.
Latent heat of vapourisation of water $= 540 c a l / g$
For $80 g$ energy required is $540 \times 80 = 43200 c a l = 43.2 k c a l$

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