LPG stands for liquefied petroleum gas and it refers to compressed gas made up of combustible hydrocarbons such as butane or propane, which are used as fuel or as a raw material component for chemical synthesis. Propane contains three carbon atoms and eight hydrogen atoms while butane is made up of four carbon atoms and 10 hydrogen atoms.
As a fuel, LPG is commonly used in heaters, cooking appliances and vehicles. It has also been used as an alternative aerosol propellant and refrigerant to chlorofluorocarbons in air conditioning systems as a means to reduce the damage to the ozone layer. LPG is derived from fossil fuels during the refining process or it can also be extracted while processing natural gas.