Question

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

Answer 1

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Explanation:

On a dry day, water vapor present in the air will be less, and the circulation of this air will provide faster cooling compared to a humid day. Humid air contains more water vapor content so energy transferred will be less and the rate of cooling will be less. Therefore desert cooler cools better on a hot dry day.

Answer 2

Explanation:

Evaporation is a cooling process that cools the surroundings. Desert coolers transfer the heat energy from circulating air to water. Water evaporates resulting in the cooling of the surrounding air and this air is circulated. ... Therefore desert cooler cools better on a hot dry day.

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

When a liquid evaporates, the particles of the liquid absorb energy from the surroundings to compensate the loss of energy during evaporation. Since evaporation causes cooling, this makes the surroundings cool.

In a desert cooler, the water inside it is made to evaporate. This leads to absorption of energy from the surroundings, thereby cooling the surroundings. Evaporation depends on the amount of water vapour present in air (humidity). 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.