Across
- 3. Gas changing to liquid as particles slow down and come together.
- 5. Measure of the average speed of particle motion.
- 6. Temperature where a liquid changes to a gas (two words).
- 7. State of matter with tightly packed particles that vibrate in place.
- 11. Particles at the surface of a liquid escaping to become gas.
- 12. Change from solid to liquid as particles gain energy.
- 13. Particles spreading out as they gain energy and speed up (two words).
- 15. Particles moving closer together as they lose energy (two words).
- 17. Particles spreading from crowded areas to less crowded areas.
- 19. Smallest pieces of matter that are always moving.
- 20. Liquid changing to gas throughout the whole substance.
- 21. How many particles are in a certain area.
Down
- 1. Movement in all directions at different speeds (two words).
- 2. State of matter with very fast, spread-out particles that fill any space.
- 4. Temperature where a liquid becomes a solid (two words).
- 8. State of matter where particles slide past each other and take the shape of their container.
- 9. All the energy in a substance, based on motion, position, and number of particles (two words).
- 10. Energy from heat that changes particle motion (two words).
- 14. Energy a particle has because it is moving (two words).
- 16. Temperature where a solid becomes a liquid (two words).
- 18. Change from liquid to solid as particles lose energy.