alleryWhich gas is usually used to lift a balloon or airship because it does not burn easily?
AHydrogen
BHelium
COxygen
DMethane
Answer & Solution
Correct answer: B. Helium
1. Lighter-than-air craft need a gas lighter than the air around them.
2. Helium is used because it is not flammable, while hydrogen is highly flammable.
3. Oxygen is not lighter than air and methane burns, so they are poor choices.
_Source: Wikipedia, Transport, section Air_
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