The boiling point of Methane is -161°C. How is the substance carried?
Official USCG Answer & Rule Citation
Correct Answer: Option D — Atmospheric pressure.
Methane (LNG) is transported as a cryogenic liquid. To maintain its liquid state at atmospheric pressure, it must be kept at approximately -161°C. Modern LNG carriers utilize membrane or spherical containment systems designed to hold the cargo at near-atmospheric pressure while heavily insulated to minimize boil-off.
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