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Across
  1. 2. Opposite of Melting
  2. 5. transitions matter changes from one state to another
  3. 6. The temperature at which a solid turns into a liquid.
  4. 8. Matter becomes flat near a _
  5. 12. Certain materials become this at extremely low temperatures.
  6. 14. Vaporization is achieved by _
  7. 18. The density at which the universe would be flat
  8. 19. Solid directly to Gas
Down
  1. 1. As this increases, particles in matter move faster and change states.
  2. 3. At constant pressure, the volume of a gas is directly proportional to this
  3. 4. This concept involves substances changing into new ones
  4. 7. These show how substances change with temperature and pressure.
  5. 9. The process of a liquid turning into a gas, often at its boiling point.
  6. 10. Beyond this, the substance is referred to as a supercritical fluid
  7. 11. Helium-4 when cold exhibits zero _
  8. 13. Gas to Liquid
  9. 15. At very low temperatures, some liquids exhibit this unusual property
  10. 16. Gas directly to Solid
  11. 17. States that at constant temperature, gas pressure is inversely proportional to its volume. _ Law