The molecules move faster and occupy more space. The molecules move slower and occupy more space. The molecules move faster and occupy less space. The molecules move slower and occupy less space.
I gave my students this multiple choice question: Which statement best describes the motion of water molecules as the water changes state from steam to liquid?

Only one answer is correct among these 4 choices:
- The molecules move faster and occupy more space.
- The molecules move slower and occupy more space.
- The molecules move faster and occupy less space.
- The molecules move slower and occupy less space.

Could you tell me which one is correct?

The molecules move slower and occupy less space.