There are many diffirent types of fuels. Anything that burns can be called a fuel, although "fuel" usually means materials that are commonly used as fuels. Wood, coal, natural gas, and gasoline are all examples of common fuels. Fuels are usually classified as solid,liquid, or gaseous. Solid fuels, such as coal can be stored in big piles and moved in tank cars, or pipelines. Gas fuels may be kept under pressure in extra-strong containers. They may be changed to a liquid for transporting in tanks, or they may be sent thousands of miles through pipelines as a gas. Today, burning fuels
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