Spilling water over your skin on a hot day will cool you down. Spilling vegetable oil over your skin on a hot day will not. Explain the difference.
Water is more volatile than vegetable oil.when water gets evaporated the endothermic process results in cooling .
Evaporation consumes energy as thermal. more evaporating=more heat lost
cooling by oil<water<alcohol
as well as, oil avoid to evaporating water of skin.