The point at which the air becomes saturated with water molecules due to cooling is called the dew point.

Here's why:

* Saturation: When air reaches its dew point, it can no longer hold all the water vapor it contains.

* Cooling: As air cools, the capacity for holding water vapor decreases.

* Condensation: When the air cools to its dew point, the excess water vapor condenses into liquid water, forming dew, fog, or clouds.

Let me know if you have any other questions!