Question

why does desert cooler cool better on a hot dry day

Answer 1

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

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Answer 2

The basic principal of cooling by desert cooler is evaporation of water. as water evaporates it absorbs heat and cools the sorroundings. on a dry hot day the rate of evaporation is high as compared to on humid or cold days. Hence the reason