Question

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

Answer 1

Answer:

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.

Answer 2

It is due to evaporation. During evaporation, molecules of acetone with greater kinetic energy leave the surface but molecules with less kinetic energy remain on the surface i.e. palm and thus due to these molecules our palm feel cold.