particulate

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Across
  1. 2. Force of gas particles hitting a container
  2. 5. Spreading of particles from high to low concentration
  3. 6. The amount of space matter occupies
  4. 8. High-energy state found in stars
  5. 9. State with no fixed shape or volume
  6. 10. Flows but has a fixed volume
  7. 12. State with a definite shape and volume
  8. 16. The amount of material in an object
  9. 17. Gas changing into a liquid
  10. 18. Liquid changing into a solid
  11. 19. Tiny moving bits that make up all matter
  12. 20. Smallest unit of an element
Down
  1. 1. Fixed, regular pattern of particles in a solid
  2. 3. Tiny gaps between particles
  3. 4. Liquid changing into a gas at the surface
  4. 5. Mass per unit volume of a substance
  5. 7. Anything that has mass and takes up space
  6. 11. CLUES
  7. 13. CLUES
  8. 14. Energy added to speed up particles
  9. 15. The attraction that holds particles together
  10. 16. Solid changing into a liquid