States of matter recap

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Across
  1. 5. The change of state from liquid to solid when heat is removed (8)
  2. 7. The change of state directly from gas to solid without becoming liquid (10)
  3. 11. A measure of the average kinetic energy of particles in a substance (11)
  4. 12. The temperature at which a liquid turns into a gas throughout the liquid (7)
  5. 13. The type of energy gas particles have due to their motion (7)
  6. 14. The process where a gas turns into a liquid when cooled (12)
  7. 15. Why did the gas balloon feel self-conscious? It was under a lot of pressure! (7)
Down
  1. 1. The object that holds a gas and allows pressure to build up (9)
  2. 2. The force exerted by gas particles colliding with the walls of a container (8)
  3. 3. The change of state directly from solid to gas without becoming liquid (11)
  4. 4. The process of gas particles spreading out to fill a space (9)
  5. 6. The change of state from solid to liquid when heat is added (7)
  6. 8. Small units of matter that move faster and spread out when heated (9)
  7. 9. The process where a liquid turns into a gas at its surface (10)
  8. 10. The amount of space that a gas occupies (6)