Particle theory of matter

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Across
  1. 6. firm and stable shape
  2. 8. anything that has both mass and volume
  3. 10. a physical change
  4. 12. the movement of heat
  5. 13. has no fixed shape or volume
  6. 14. energy that comes from a source
  7. 15. flows freely and is of constant volume
  8. 17. energy with moving electric charges
  9. 18. particles that are always moving
  10. 19. energy of motion
Down
  1. 1. temperature at which the pressure upon a liquid
  2. 2. a substance that is made up of one kind of particle
  3. 3. how heavy and object is
  4. 4. how hot of cold something is
  5. 5. how much space an object takes up
  6. 7. when a solid melts
  7. 9. a substances that transforms into a new one
  8. 11. how much matter is in an object
  9. 16. the use of nuclear reactions to produce energy
  10. 20. the temperature difference between objects