Final answer:
When the kinetic energy of water molecules has been reduced sufficiently so the molecules can come together, condensation occurs, forming the crystal structure of the solid.
Step-by-step explanation:
When the kinetic energy of water molecules has been reduced sufficiently so the molecules can come together, condensation occurs, forming the crystal structure of the solid. In condensation, the water molecules lose enough kinetic energy to overcome the attractive forces between them and transition from a gas to a liquid state. This process is responsible for the formation of liquid water on the outside of a cold glass when water vapor in the air is cooled by the glass.