On a cool morning, Uyen’s breath can form a cloud when she breathes out. Which changes of state are most responsible for Uyen seeing her breath in this way?

Warm, moist air from Uyen’s breath cools when it meets the colder outdoor air. Water vapor changes into tiny liquid droplets, a change of state called condensation. Those droplets scatter light and appear as a cloud, so condensation is the best answer; deposition would form ice directly from water vapor.

AI-written and checked against the verified answer.