Question

Why do we feel cold when we keep acetone on our plam

Answer 1

because acetone evaporates when comes in contact with surface of the palm

Answer 2

this increases the liquid molecules around it in vapour phase thus our palm feel cold. acetone,petrol or perfume has very low boiling temperature. when we put some acetone on our palm the particles of it gain energy from our palm and evaporate quickly which causes cooling .