Pressure

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Across
  1. 3. A space with no matter at all.
  2. 5. Small forces over an area exerts _______.
  3. 6. Solid changing state to a liquid is called _______.
  4. 7. The state of matter with the most energy.
  5. 9. What was held in Paris over the summer?
Down
  1. 1. Famous song by Queen and David Bowie.
  2. 2. The opposite of explosion.
  3. 4. What was crushed in a demonstration.
  4. 8. The smallest particle of an element.