Liquefied petroleum gas (propane-butane). Oil is extracted and refined, converted to a liquid state by cooling to a critical temperature condensated as a result of heat dissipation of vaporization.
LNG
(LIQUIFIED NATURAL GAS)
When natural gas is cooled to -160℃, the gas is compressed by a volume of 600 times, and its weight is halved compared to the gaseous state. Liquefied natural gas is formed.
Compressed natural gas (methane) — gaseous hydrocarbons formed in the Earth's crust, a highly economical energy fuel.
Synthetic natural gas (SNG): has the same combustible properties and basic chemical composition as natural gas but is synthesized from coal and oil.