What's the Matter?

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Across
  1. 2. A measurement of how fast particles are moving and rubbing against each other.
  2. 4. A state of matter where the particles are held loosely together.
  3. 6. To use heat in order change state from a liquid to a gas.
  4. 9. To make or become a liquid.
  5. 12. A state of matter where the particles are held tightly together.
  6. 13. To change state from a gas to a liquid.
  7. 14. To decrease in volume (become smaller).
  8. 16. A small portion of matter.
  9. 17. The mass of something divided by it's volume.
  10. 19. To change state from a liquid to a gas.
  11. 20. To increase in volume (become larger).
Down
  1. 1. To change state from a liquid to a solid.
  2. 3. To change state from a solid directly to a gas.
  3. 5. To move from an area of high concentration to an area of low concentration.
  4. 7. Bumping into something else with force.
  5. 8. To change state from a solid to a liquid.
  6. 10. A state of matter where the particles fly past each other with speed.
  7. 11. Qualities/characteristics of a particular person or thing.
  8. 15. To push/squeeze in order to make smaller.
  9. 18. Anything with mass which exists in space.