Methane molecules generally like their personal space and are difficult to pack closely together, so natural gas must be subjected to high pressures to store enough of it to fuel a vehicle over long enough distances. To withstand these high pressures, natural gas tanks are big, thick-walled and cylindrical, so they would take up the entire trunk of an average sedan.
In vehicles is used as compressed natural gas (CNG), which is stored in special cylinder tanks at 3,600 pressure per square inch or as liquefied natural gas (LNG), which is purified and condensed into a liquid by cooling it to -260°F.
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