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     Fuel gases are sources of potential heat energy or light energy that can be readily transmitted and distributed for residential or industrial consumption. Natural gas, LNG, LPG and CNG are the most common types of fuel gas. Natural gas, composed primarily of methane, is odorless, colorless, non-toxic and non-corrosive. It includes non-associated gas and associated gas. LNG is natural gas (predominantly methane, CH4) that has been converted to liquid form for ease of storage or transport. The natural gas is condensed into a liquid at close to atmospheric pressure (maximum transport pressure set at around 25 kPa (4 psi)) by cooling it to approximately −162 °C (−260 °F). LPG is the byproduct of petroleum extraction and refining. It is the compound of propane and butane with traces of propylene and butane. CNG is made by compressing natural gas to less than 1 percent of the volume it occupies at standard atmospheric pressure. It is stored and distributed in form of gas in hard containers at a pressure of 200–248 bar (2,900–3,600 psi), usually in cylindrical or spherical shapes. With the same chemical composition as pipeline gas, it can also be used as motor fuel.