Question

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

Answer 1

cooling in room by desert cooler is caused by evaporation of water a desert cooler cools better in hot and dry day because tempt on a hot day increases the rate of evaporation of water.
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Answer 2

A desert cooler cools better on a hot dry day because on a hot dry day temperature is high and humidity is less which helps in better evaporation. Due to the higher rate of evaporation it gives better cooling effect.