Multiple choice

Why is helium preferred over hydrogen for use in airships?

  1. Helium has a low density

  2. Helium has a high density

  3. Helium is chemically less reactive

  4. Helium is chemically more reactive
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Helium is used instead of hydrogen because helium is an inert noble gas that does not burn or explode. Hydrogen is highly flammable and poses a catastrophic fire risk, as demonstrated by the Hindenburg disaster. While both gases have low density providing lift, helium's chemical inertness makes it the safer choice for airships.

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