why does a desert cooler cool better on a hot dry day
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A hot dry day means the temperature of the atmosphere is high and humidity of air is low and both these factors increase the rate of evaporation & thus enromus cooling is produced.
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The particles of liquid in desert cooler absorb energy from the surrounding to regain the energy lost during evaporation. In summer this is fast. Hence desert cooler cool better in a hot dry day.
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