alleryWhy is helium usually preferred to hydrogen as a lifting gas in airships?
AHelium is red in colour
BHydrogen is heavier than air
CHydrogen is highly flammable
DHydrogen is very costly to find
Answer & Solution
Correct answer: C. Hydrogen is highly flammable
1. Aerostats gain lift from a gas less dense than the surrounding air.
2. Helium is typically used because hydrogen is highly flammable.
3. Hydrogen is in fact lighter than air, so weight is not the reason.
_Source: Wikipedia, Transport, Air_
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