Question

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

Answer 1

Answer:

The water when evaporated from a desert cooler absorbs energy from the surrounding and makes the surrounding cool. Evaporation is inversely proportional to humidity. Lesser the humidity and higher the temperature, the faster is the evaporation. So on a hot dry day, the evaporation is more so the surrounding is more cooled. So, a desert cooler cools better on a hot dry day.

Answer 2

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.

Hope it will help you.