Question

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

Answer 1

When we put some acetone or petrol or perfume on our palm, it evaporates. During evaporation, particles of the liquid absorb energy from the surrounding or 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.

Answer 2

Thank you again, hakkunamatata.

Answer 3

here also the acetone/petrol liquid requires latent heat of vaporisation which it draws from our hand, thus bringing down its temperature...