Question

why do we feel cool when we pour acetone on our palms

Answer 1

Hey!!
Here is the answer..

Because of the latent heat of vaporisation , as these materials take away heat from our body to convert into vapours, this gives a cooling effect and as a result, our palm feel cold when we put some acetone.
Also,
The acetone absorbs our skin heat and evaporates rapidly, cooling the skin as it evaporates from it. 

I hope my answer helped!!

Answer 2

why do we feel cool when we pour acetone on our palms

• Acetone has very low boiling temperature.
• When we put some acetone on our palm the particles of it gain energy from our palm & evaporate quickly which causes cooling.