Water vapor becomes ice. Liquid water becomes ice. Water vapor becomes liquid water. Liquid water becomes water vapor.
I gave my students this multiple choice question: Which occurs as the kinetic energy of water molecules increases?

Only one answer is correct among these 4 choices:
- Water vapor becomes ice.
- Liquid water becomes ice.
- Water vapor becomes liquid water.
- Liquid water becomes water vapor.

Could you tell me which one is correct?

Liquid water becomes water vapor.