Puzzle

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