Particle Theory

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Across
  1. 3. firm and stable in shape; not liquid or fluid
  2. 4. break away or damage under pressure
  3. 7. go in a specific direction or manner
  4. 8. any substance that takes up space by having
  5. 10. moving rapidly to and fro
  6. 12. drawing toward something
  7. 14. in the period separating two points in time
  8. 18. position (two or more items)at a distance from one another
  9. 19. able to withstand force, pressure or wear
Down
  1. 1. takes the shape of the container and has a fixed volume
  2. 2. amount of space a substance or object occupies
  3. 3. external form, or outline of something
  4. 5. smallest particle of a chemical element that can exist
  5. 6. decrease in size, number or range
  6. 9. minute portion of matter (plural)
  7. 11. strength or energy as an attribute of physical action or movement
  8. 13. very small
  9. 15. become or make larger or more extensive
  10. 16. property of matter and radiation
  11. 17. no fixed volume and no fixed shape