Answer:
The answer is Condensation.
Step-by-step explanation:
When water drops appear on the outside of a cold glass, what happens is that the water vapor contained in the environment condenses on the outside of the glass. When the glass is cold because it contains a cold drink, the temperature next to the surface of the glass decreases, and with it its ability to contain water vapor. The saturation point decreases and the water vapor contained in the air, that is, humidity, condenses into small droplets on the surface of the glass.