Why is cooling caused by evaporation?
Answers
Answer:
Evaporation causes cooling because the process requires heat energy. The energy is taken away by the molecules when they convert from liquid into gas, and this causes cooling on the original surface.
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Liquid evaporating from a surface has a cooling effect. And different liquids have this effect to different degrees. For example, rubbing alcohol has more of an evaporative cooling effect than water. Alcohol evaporates comparatively more quickly than water, so scientists class it as a "volatile" liquid. But regardless of the liquid, they all follow the same principle of evaporative cooling. In its liquid state, the substance—whether water or alcohol—has a certain heat content, which is central to the process. Also critical to this are two of the three basic phases of matter: liquid and vapor.