science words

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Across
  1. 1. a substance that flows freely
  2. 5. the degree of compactness of a substance
  3. 7. heat and energy is through direct contact
  4. 8. the measure of hotness or coldness
  5. 9. activity involving mental or physical effort
  6. 12. travels through space at the speed of light
  7. 13. that heat is transferred by movement of a heated liquid
  8. 16. the energy contained within a system.
  9. 19. a speed of something in a given direction
  10. 20. firm and stable in shape
Down
  1. 2. a substance of which does not allow the passage of heat or sound
  2. 3. stored energy
  3. 4. physical substance in general
  4. 6. energy that is transferred from one thing to another
  5. 10. energy of motion
  6. 11. a set of things that work together
  7. 14. a minute portion of matter
  8. 15. move from one place to another
  9. 17. the strength required for sustained for physical or mental activity
  10. 18. a substance of matter that will expand