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transpiration causes loss of water but how come it cools down the temperature of the leaf? plz explain...

 hey think about it... whenever water evaporates, it absorbs the heat of the surface, right? so in the same way, when the water evaporates through the stomata, it cools the leaf. 

hope i helped :)

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in chemistry you must have studied evaporation causes cooling.
so the same principle is applied here.
 
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evaporation causes cooling is simple concept of chemistry
the water at the surface evaporates because of the heat of the surface so it  cools down that surface by bringing down the temperature
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When the water evaporates, it absorbs the latent heat of vaporization, which cools down the surface from where the water is evaporating.
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