* Solid (Ice): Molecules are tightly packed in a crystalline structure and vibrate slowly in place. This is the slowest molecular motion.
* Liquid (Water): Molecules have more freedom to move around and are constantly bumping into each other. They move faster than in ice.
* Gas (Water Vapor): Molecules are widely spaced and move very rapidly, colliding frequently. This is the fastest molecular motion.
Therefore, the phases of water from slowest to fastest molecular motion are:
1. Solid (Ice)
2. Liquid (Water)
3. Gas (Water Vapor)