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 surrounding environment in order to compensate for the energy lost during the evaporation process. Because evaporation produces cooling, the surrounding environment becomes cooler as a result.
- The water inside a desert cooler is forced to evaporate in order for it to function properly. This results in the absorption of energy from the surrounding environment, which cools the surrounding environment.
- The amount of water vapor present in the air has an effect on the rate of evaporation (humidity). Evaporation occurs more frequently when the amount of water vapor present in the air is less.
- On a hot, dry day, the amount of water vapour present in the air is reduced significantly.
- As a result, the water contained within the desert cooler evaporates at a faster pace, thus chilling the surrounding area. On a hot, dry day, this is why a desert cooler performs better at cooling.