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Parul from Kv , asked a question
Subject: Science , asked on 26/4/13

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

Bani Sood , added an answer
Answered on 26/4/13

In a desert cooler, the water inside it is made to evaporate. This leads to absorption of energy from the surroundings, thereby cooling the surroundings. Again, we know that evaporation depends on the amount of water vapour present in air (humidity). If the amount of water vapour present in air is less, then evaporation is more. On a hot dry day, the amount of water vapour present in air is less. Thus, water present inside the desert cooler evaporates more, thereby cooling the surroundings more. That is why a desert cooler cools better on a hot dry day.

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Namitha Ashik , From Indian School , added an answer
Answered on 26/4/13

 On a hot dry day the temperature is high and the watervapour holding capacity of the air is also high ,thus evaporation takes place. The water in the cooler evaporates taking the enrgy from its surronding and hence it leaves the surrounding cool too. This is the reason why a desert cooler cools better on a hot dry day....

concentrate n study well dear........hope this helps ya...

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