WHATS THE MATTER?

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Across
  1. 4. / The process where a liquid changes to a gas at the surface (not necessarily boiling)
  2. 6. / How tightly packed particles are; affects whether something sinks or floats
  3. 8. / The amount of space an object takes up (measured in mL or cm³)
  4. 9. / The fourth state of matter (ionized gas, like in stars or neon signs)
  5. 12. / Direct change from solid to gas without becoming liquid (like dry ice)
  6. 14. / State of matter with definite volume but no definite shape; particles slide past each other
Down
  1. 1. / The temperature at which a solid melts into a liquid
  2. 2. / State of matter with no definite shape or volume; particles move freely and far apart
  3. 3. / Change from liquid to solid (happens at the freezing point)
  4. 5. / The temperature at which a liquid turns into a gas throughout the substance
  5. 7. / Process where a gas changes directly to a solid (opposite of sublimation)
  6. 10. / State of matter with definite shape and definite volume; particles vibrate in place
  7. 11. / Anything that has mass and takes up space
  8. 13. / Measure of how much matter is in an object (often measured in grams)