why does a desert cooler cool better on a hot dry day
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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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The water when evaporated from a desert cooler absorbs energy from the surrounding for compensating the loss of energy during evaporation making the surrounding cool. Evaporation is inversely proportional to humidity. So on a hot dry day, the evaporation is more so the surrounding is more cooled.
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