Q 1. Why does a desert cooler cool better on a hot dry day?
A desert cooler cools better on a hot and dry day. It is because the inner walls of the cooler get sprinkled by the water continuously and due to warm, dry weather, this water gets evaporated.
Evaporation cause cooling of the present air inside of the cooler. This cold air is sent in the room by a fan.
Because the lager latent heat of vaporisation of water to cool the hot surface.
On a hot dry day there is a high temperature and low humidity both this factor are reseprespon for increase in evaporation this also means better cooling