What most likely happens when water vapor cools? a. it changes into gas. b. it changes into liquid. c. its temperature increases. d. its temperature remains constant.

Option (B) is the correct answer.

Explanation:

When water converts from vapor form to liquid form then this process is known as condensation.

Water vapors are the gaseous form of water, that is, its molecules are weakly held by Vander waal forces.

When temperature is decreased then water vapor converts into liquid form.

Thus, we can conclude that when water vapor cools then most likely it changes into liquid.