Changes of state

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Across
  1. 3. Change of state from liquid to gas which can happen at any temperature
  2. 5. Change of state from solid to liquid
  3. 7. Have a fixed shape and cannot flow
  4. 9. The tiny objects that materials are made from
  5. 11. Change of state from solid to gas
Down
  1. 1. How much matter there is in a certain volume
  2. 2. Change of state from gas to liquid
  3. 4. Change of state from liquid to gas in which bubbles form
  4. 6. Change of state from liquid to solid
  5. 8. Have a fixed volume but take the shape of their container
  6. 10. Have no fixed shape and can be squashed