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Tanker Familiarization Liquefied Natural Gas (LNG) Practice Exam

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Methane’s vapor density relative to air is 0.55, indicating it is lighter than air. What does this imply about its buoyancy compared with air?
Correct Answer:
It is lighter than air
Explanation:
Buoyancy depends on density relative to the surrounding air. If a gas is lighter than air, it displaces air that weighs more than the gas itself, producing a net upward force. Methane having a density of 0.55 times that of air means it is lighter than air, so it experiences positive buoyancy and rises. It will generally move upward and disperse, rather than sinking or staying at the same level. The other ideas don’t fit because a heavier-than-air gas would sink, a gas with the same density would be neutrally buoyant, and gases do mix with air rather than staying completely separate.

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