How do zeppelins fly?

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Tags

  1. #outside
  2. #pressure
  3. #controls
  4. #blimp
  5. #helium
  6. #water
  7. #ballast
  8. #heavy
  9. #airship
  10. #ballonets
  11. #envelope
  12. #tanks
  13. #buoyancy
  14. #expands
  15. #shape
  16. #decreases
  17. #generate
  18. #submarine
  19. #holding
  20. #helps
  21. #rises