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Which storage advantage does liquefied petroleum gas have?

  • A.Nothing
  • B.Liquefaction at only a few bar, so the tank is far lighter than the high pressure cylinder methane requires
  • C.It liquefies at a modest pressure
  • D.It requires no pressure vessel at all, since it remains liquid at atmospheric pressure and ordinary temperature

Answer: C

Propane and butane liquefy at a few bar while methane needs hundreds. The last option explains exactly that difference, which makes it a correct and more instructive version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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