Question

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Why does a desert cooler better on a dry day?​

Answer 1

Evaporation depends on the amount of water vapour present in air (humidity). ... 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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Answer 2

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CONCEPT - EVAPORATION

Explanation :-

1) The desert cooler is generally used in evaporating the water stored inside it.

2) It results in the absorption of the energy and cooling of the environment.

3) We know that , the evaporation depends on the amount of humidity present in the air , so if the amount of water vapour in the air is less , than the process of evaporation would be more.

4) On a hot and dry day , the amount of water vapour in the atmosphere is less .

5) Therefore , the amount of water present in the desert cooler would evaporate at a faster rate and results in the cooling of the surrounding.

THEREFORE , DESERT COOLER COOLS THE SURROUNDING BETTER AT A HOT , DRY DAY.