states of matter

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Across
  1. 3. Liquid to gas at surface over varying temperatures
  2. 6. Gas back into a liquid
  3. 7. Fixed volume and shape; particles vibrate in place
  4. 8. Gaseous phase of a substance normally liquid or solid
  5. 12. Solid to liquid
  6. 13. Fixed volume; takes shape of container
  7. 15. Change of state from liquid to gas at a specific temperature
  8. 17. Measure of average kinetic energy
  9. 19. Solid transforms directly into a gas
  10. 20. Spreading of particles from high to low concentration
Down
  1. 1. Temperature at which pure solid becomes liquid
  2. 2. Amount of space occupied by matter
  3. 4. Temperature at which liquid changes to gas
  4. 5. Rapid back-and-forth movement in solids
  5. 9. Force exerted on container walls by gas particles
  6. 10. Gas directly into a solid
  7. 11. Energy gained by particles when heated
  8. 14. Liquid to solid
  9. 16. Fills any space; no definite shape or volume
  10. 18. A space with no particles or matter in it