Tanker Familiarization Liquefied Natural Gas (LNG) Practice Exam

What is the specific gravity of LNG?

0.45 0.60 0.30 0.50

Correct Answer:

0.45

Explanation:

Specific gravity tells you how heavy LNG is compared with water. LNG is kept cryogenically cold and mainly consists of methane, giving it a density around 450 kg per cubic meter. With water at about 1000 kg per cubic meter, the LNG specific gravity is roughly 0.45. Because it’s less dense than water, LNG would float on a water surface as a liquid, which influences how it behaves in spills and how cargo tanks affect buoyancy during loading and unloading. The exact value can vary with the gas blend and temperature, but 0.45–0.50 is a typical range used in practice; exams often use 0.45 as the standard figure. Values like 0.60 would be much denser than LNG usually is, and 0.30 would be too light for this liquid.

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