Puzzle

1234567891011121314
Across
  1. 4. An arrangement of numbers in a pattern used for solving mathematical problems
  2. 6. Allows current to flow in one direction
  3. 7. An instrument which use to find direction
  4. 9. React with acids and produce hydrogen gas
  5. 11. An equipment use to measure the pressure
  6. 12. A type of polymer used to make non-stick pans
  7. 14. Energy that flows from a high temperature body to a low temperature body
Down
  1. 1. Substance in the gas state
  2. 2. An apparatus for reducing or increasing voltage of alternating current
  3. 3. Subatomic particle with negative elementary electric charge
  4. 5. water in solid state
  5. 8. A flow of electron due to a potential different
  6. 10. Positive particle of matter that is part of the nucleus of an atom
  7. 13. A type of energy