Question

\Why does our palm feel cold when we put some acetone or petrol or perfume on it?

Answer 1

Acetone, petrol, perfume etc., being volatile, evaporate very fast when exposed to larger surfaces. When we put some acetone or petrol or perfume on our palm, it evaporates. During evaporation, particles of the liquid absorb energy from the surface of the palm to compensate for the loss of energy, making the surroundings cool. Hence, our palm feels cold when we put some acetone or petrol or perfume on it.