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Across 4. The average energy of motion of the particles of a substance. 6. Force divided by pressure. 8. The amount of space that matter occupies. 10. At a constant temperature, a principle that describes the relationship between the pressure and the volume of a gas. 12. The change of state from a gas to a liquid. 16. A solid made up of particles that are not arranged in a regular pattern. 19. When vaporization takes place within the liquid as well as on the surface. 20. Force divided by area 21. A liquid's resistance to flowing. 22. When vaporization takes place on the surface of a liquid.

Down 1. A state of matter with no definite shape or volume. 2. A solid in which the particles are arranged in a regular, repeating pattern. 3. Changing state from a liquid to a gas. 5. The ( 0,0 ) point on a line. 7. The temperature when a solid changes to s liquid. 9. A state of matter that has a definite shape and volume. 11. The molecules of a liquid have an inward pull that brings the molecules on the surface closer together. 13. Change in state from a solid to a liquid. 14. At constant pressure, the principle that describes the relationship between the temperature and the volume. 15. Changing solid to a gas without passing through a liquid state. 17. A coordinate plane. 18. Any substance that can flow.