Lighter hydrocarbons (mainly propane and butane) that have been liquefied by special processes.
Gas that occurs naturally as a constituent of wet natural gas or crude oil or produced as a byproduct of petroleum refining.
LPG): LPG is also called propane. A mixture of gaseous hydrocarbons, mainly propane and butane that change into liquid form under moderate pressure. LPG is commonly used as a fuel for rural homes for space and water heating, as a fuel for barbecues and recreational vehicles, irrigation and grain drying and as a transportation fuel. It is normally created as a by–product of petroleum refining and from natural gas production.