Question

why does our Palm feel cold when we put some Acetone or petrol or perfume on it

Answer 1

It is because of the process called evaporation.
Substances like acetone/ petroleum are highly volatile compounds meaning that they evaporate easily with low boiling points! when we place them on our hand, they utilise the body temp for their evaporation. Since they evaporate using our body temp, they make the palm feel cold!

Answer 2

Answer:

Acetone, petrol and perfume are volatile liquids (which can change into vapours easily). When we put some acetone , petrol or perfume on our palm, the acetone, petrol or perfume evaporate rapidly and our palm feels cold. This is due to the fact that to change from the liquid to the vapour state, acetone, petrol or perfume require latent heat of vaporisation. The acetone, petrol or perfume take this latent heat of vaporisation from our palm. The palm loses heat and feels cold.