alleryWhy is helium usually chosen to lift airships?
AHydrogen is heavier
BHydrogen is costlier
CHelium is denser
DHydrogen burns easily
Answer & Solution
Correct answer: D. Hydrogen burns easily
1. Airships use helium as the typical lifting gas.
2. Hydrogen is highly flammable, which makes it dangerous to use.
3. Hydrogen is lighter than helium, not heavier, and helium is less dense, not denser.
_Source: Wikipedia, Transport: Air_
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