LGTCO/LGTF Exit Exam • Set 2 Question 19 of 30

What is the density of Methane gas at ambient temperature compared to air?

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Direct Answer

Option D: Lighter than air (relative density ~0.55)

Methane vapor has a relative density of approximately 0.55 compared to air at ambient temperature, making it significantly lighter than air, causing released gas to rapidly rise and disperse upward.

All Options

Same as water

Heavier than lead

Heavier than air

Lighter than air (relative density ~0.55) (Correct Answer)

Detailed Explanation & Context

Methane vapor has a relative density of approximately 0.55 compared to air at ambient temperature, making it significantly lighter than air, causing released gas to rapidly rise and disperse upward.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).

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