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Balloons are filled with

  • A.Nitrogen
  • B.Helium
  • C.Oxygen
  • D.Argon

Answer: B

Balloons are filled with helium. It is much lighter than air, giving good lift, and unlike hydrogen it does not burn.

Hydrogen lifts slightly better but is dangerously flammable, as the Hindenburg disaster of 1937 demonstrated.

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