Liquefied petroleum gas, or LPG, is manufactured both from crude oil and natural gas. Through compression, the gas is condensed to a point where it becomes a liquid. It must, however, be maintained under pressure, which means it can be stored only in pressurized tanks or cylinders.
The most common liquefied petroleum gas is propane. LPG is used as a heating and cooking fuel in recreation vehicles, and, in many rural communities, as a home heating fuel. It can also be used as a motor fuel.
See also Refining process.