Question

1. 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 for compensating the loss of energy during evaporation making the surrounding cool. Evaporation is inversely proportional to humidity. So on a hot dry day, the evaporation is more so the surrounding is more cooled. 

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Answer 2

$\huge \tt\underline \color{yellow}{Answer:-}$

A hot dry day means temperature of the atmosphere is high and humidity of air is low. Both these conditions increases the rate of evaporation and thus cause enormous cooling.