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Compressed Natural Gas or CNG is simply Natural Gas mainly comprised of Methane that is stored under high pressure (while remaining in its gaseous form), mainly as a means to transport it, or as storage for later use as vehicle fuel. In this form it remains clear, odourless, and non-corrosive. CNG is used widely as an alternative fuel for vehicles as it has a fairly high octane rating. CNG is not to be confused with Liquified Natural Gas (LNG), which has been turned into a liquid —and must be at very low temperatures. Although it's still in its gaseous form, Compressed Natural Gas is under more pressure and thus takes up a smaller volume than ordinary Natural Gas (but more volume than LNG).