Question

what is the effect of evaporation on surrounding

Answer 1

Cooling by Evaporation. When water evaporates, the latent heat of vaporisation is absorbed from the surroundings and this produces a cooling effect. The larger the surface area the greater the rate of evaporation. 'Dry' air is air that contains very little moisture but can accept greater amounts of water vapour.
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Answer 2

by the evaporation the surrounding become cool because it absorb the heat from the surrounding