The Full form of LPG is Liquefied Petroleum Gas. LPG also refers to as simply propane, butane, isobutene etc. that are flammable mixtures of hydrocarbon gases used as fuel in cooking equipment, heating appliances and vehicles. These gases are liquefied by pressurization and commonly used as fuel. LPG is colourless, odourless and heavier than air. It has a high caloric or heating value that allows it to produce more heat in a short time. It is a clean-burning fuel which is usually sold in different sizes of cylinders in liquid form. So, it is a portable, convenient energy source that is easy to use, store and transport. The unpleasant smell of the LPG is due to the presence of an odorant which is added to LPG for safety reasons. LPG is extracted from crude oil and natural gas through processing and refining respectively. So, it is a fossil fuel closely related to oil. Around 65% of the LPG that we use is obtained directly from deep within the earth and the remaining is manufactured indirectly from petroleum or crude oil found under the surface of earth. It exists in liquid and vapour form that depend on the pressure and temperature, e.g. when 270 litres of LPG (propane) is compressed it becomes one litre of liquid LPG.