Discussion
Liquefied petroleum gas consists chiefly of
Answer: D
Correct answer: propane and butane
LPG is the C3 and C4 fraction - propane and butane - which are gases at ambient conditions but liquefy under modest pressure, so a large amount of energy travels in a small cylinder. That is the whole basis of the fuel. Methane and ethane require far higher pressure or cryogenic temperature and are handled as CNG or LNG instead.
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