Question

why does our palm feel cool when we put some petrol & perfume ?

Answer 1

it converts into vapour at a fast rate. 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 .

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Answer 2

When we put some acetone , perfume or petrol on our palm the particles of it gain energy from our palm and evaporate quickly which cause cooling.