ARA Christmas Crossword

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Across
  1. 2. Visualise light density
  2. 4. A sparky way to remove metal
  3. 7. Give the pressure a gentle knock
  4. 8. The S in CoSHH
  5. 12. Prevent with water treatment
  6. 13. Oops I tripped into turbulence
  7. 16. The S in HSAW 1974
  8. 17. The second P in PPE
  9. 19. Straightens the flow
  10. 22. The A in SLAM
  11. 24. Keeping measuring gauges accurate
  12. 25. What does the F stand for in F-35?
  13. 26. Speed range of the wind tunnel
Down
  1. 1. Unit of thermodynamic temperature
  2. 3. Strong steel
  3. 5. It's not real but is it super?
  4. 6. Unit of sound
  5. 9. Coherent light source
  6. 10. The L in SLA
  7. 11. Surname of the first Chief Executive?
  8. 14. The V in PIV
  9. 15. Is the air dry?
  10. 18. Unit of potential difference
  11. 20. What does the P stand for P-51 Mustang?
  12. 21. First Chair of ARA Council
  13. 23. Measurement of air speed