Puzzle

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Across
  1. 1. energy that flows from a high temperature body to a low temperature body
  2. 4. an instrument which use to find direction
  3. 5. substance in the gas state
  4. 6. react with acids and produce hydrogen gas
  5. 8. water in solid state
  6. 10. a type of energy
  7. 11. an apparatus for reducing or increasing voltage of alternating current
  8. 12. allows current to flow in one direction
  9. 13. positive particle of matter that is part of the nucleus of an atom
Down
  1. 2. subatomic particle with negative elementary electric charge
  2. 3. an equipment use to masseur the pressure
  3. 7. an arrangement of numbers in a pattern used for solving mathematical problems
  4. 9. a flow of electron due to a potential different
  5. 11. a type of polymer used to make non-stick pans