rubbing isopropyl alcohol gives a cooling sensation on the skin. why?
Also, evaporation plays an important role. This is because to turn a liquid into a gas, you have to break all of the intermolecular forces that hold that liquid together (these can include Van der Waals foces, dipole-dipole forces, and in the case of an alcohol, hydrogen bonding). Breaking all those attractive interactions requires a lot of energy. When alcohol evaporates on your skin, your body is supplying most of the energy to break all of those intermolecular interactions. Any endothermic reaction will feel cold. When you use one of those instant cold-packs, a special endothermic chemical reaction inside the pack is what makes it so cold suddenly.