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NCERT CLASS IX - Science Textbook

Chapter 1 - Matter in Our Surroundings

Why does a desert cooler cool better on a hot dry day?


In a hot dry day the air can hold a big amount of water vapour because the amount of water vapour in the air is less in a hot dry day. So the desert cools better and faster.

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Evaporation increases when temperature increase and when humidity decrease . on hot dry day , temperature is more and humidity is less so ,desert cooler cool better on a hot dry day . 
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