How do puddles evaporate without boiling?

How Puddles Disappear Without Boiling

It sounds a bit like magic when a puddle after a heavy rain shower slowly vanishes into thin air, especially on a day that doesn't feel particularly hot. You might wonder how liquid water can turn into gas without ever reaching that bubbling, boiling point on your kitchen stove. The secret comes down to energy, but on a microscopic scale rather than a bulk temperature change.

Water is made up of billions of tiny molecules holding onto each other, but they are constantly moving around. When photons—the tiny packets of energy that make up light from the sun—shine down and strike the surface of the puddle, they deliver localized bursts of energy directly to individual water molecules. This specific hit gives a lucky molecule just enough kinetic kick to break free from the invisible bonds holding it to its neighbors.

Once freed, that molecule escapes directly into the surrounding air as invisible water vapor. Even though the overall temperature of the puddle stays cool, individual molecules are constantly getting enough solar energy to make their great escape. Over time, as countless individual molecules get knocked loose by sunlight, the entire puddle completely dries up without ever needing to boil.