Question

why does a desert cooler cool better on a hot dry day

Answer 1

When the liquid evaporates the particles of the liquid a get energy from its surroundings and loose its energy during evaporation , so the surrounding become cool and the water inside cooler starts evaporate. So now it absorbs energy from surrounding. Since it is a hot dry day water vapor in air is less. This is why desert cooler cools dry better on a hot dry day.

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Answer 2

Answer:

The cooling in a desert room cooler is caused by evaporation of water. A desert cooler cools better on a hot and dry day because the higher temperature on a hot day increases the rate of evaporation of water, and the dryness of air also increases the rate of evaporation of water. And due to increase the rate of evaporation of water, a desert room cooler cools better on a hot dry and day.