Liquefied Petroleum Gas (LPG) is a mixture of hydrocarbons, which are in gaseous state at ambient temperature and pressure but these are liquefied under pressure for easy storage, handling and transportation in pressurized vessels. It is obtained through Crude Oil refining or from Natural Gas through fractionation. Butane and Propane are the main constituent hydrocarbon's in LPG. Others present in traces or small fractions are Iso-butane, butylene, n-butane, propylene etc.

LPG is a blend of Butane and Propane readily liquefied under moderate pressure. LPG vapour is heavier than air; thus it normally settles down in low-lying places. Since LPG has only a faint scent, a mercaptan odorant is added to help in its detection. In the event of an LPG leak, the vapourisation of liquid cools the atmosphere and condenses the water vapour contained in it to form a whitish fog, which is easy to observe. LPG in fairly large concentrations displaces oxygen leading to a nauseous or suffocating feeling.

LPG is one of the safest, economical, eco friendly healthy cooking fuels for all. Besides domestic usage, LPG is often used as an efficient source of energy in various industrial and commercial applications.