Solids, Liquids, Gases

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Across
  1. 1. The amount of space an object occupies.
  2. 5. The particles in a gas are in a constant, random _____.
  3. 8. A measure of the average kinetic energy of particles.
  4. 9. The freezing point of water in degrees Celsius.
  5. 11. The particles in a liquid can slide past each other, giving them a definite _____.
  6. 13. The process of a gas turning into a liquid.
  7. 19. The process of a liquid turning into a gas at the surface.
  8. 20. The direct change from a solid to a gas, skipping the liquid phase.
Down
  1. 2. The state of matter with a fixed volume but no fixed shape.
  2. 3. This state of matter has molecules that are tightly packed and vibrate in place.
  3. 4. This gas makes up most of Earth's atmosphere.
  4. 6. The temperature at which a liquid becomes a solid.
  5. 7. The particles that make up all matter.
  6. 10. The process of a gas turning into a solid.
  7. 12. The state of matter with a fixed shape and volume.
  8. 14. The scientific term for a solid turning into a liquid.
  9. 15. The opposite of melting.
  10. 16. The process of a liquid turning into a gas.
  11. 17. A substance that has no fixed volume or shape.
  12. 18. Matter can be found in a total of five states, including plasma and this.