Here's why:

* Evaporation is the process of a liquid changing into a gas. It occurs when the liquid's molecules gain enough energy to break free from the liquid's surface and enter the surrounding air.

* Cooling a gas reduces the energy of its molecules. This means they slow down and move closer together.

What happens to a gas when it's cooled?

* Condensation: As a gas cools, it may transition into a liquid. This is called condensation. Think of the water droplets forming on a cold glass of water.

* Sublimation: In some cases, a gas can directly transition into a solid, skipping the liquid phase. This is called sublimation. Think of dry ice (solid carbon dioxide) turning directly into gas.

Let me know if you have any other questions!