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

The feeling of coldness when acetone, petrol, or perfume is applied to the palm is due to a process called evaporative cooling. These substances are volatile liquids, meaning they readily evaporate at room temperature. Evaporation is an endothermic process, which means it absorbs heat from its surroundings. When you apply these liquids to your skin, the heat required for their evaporation is drawn from your skin's surface, resulting in a cooling sensation. The faster the evaporation rate, the more pronounced the cooling effect. Acetone, petrol, and perfume all have relatively high vapor pressures, leading to rapid evaporation and a noticeable drop in temperature on the skin.