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Solid fuel refers to various types of solid material that are used as fuel to produce energy and provide heating, usually released through combustion. Solid fuels include wood (see wood fuel), charcoal, peat, coal, Hexamine fuel tablets, and pellets made from wood (see wood pellets), corn, wheat, rye and other grains. Solid-fuel rocket technology also uses solid fuel (see solid propellants). Solid fuels have been used by humanity for many years to create fire. Coal was the fuel source which enabled the industrial revolution, from firing furnaces, to running steam engines. Wood was also extensively used to run steam locomotives. Both peat and coal are still used in electricity generation today. The use of some solid fuels (e.g. coal) is restricted or prohibited in some urban areas, due to unsafe levels of toxic emissions. The use of other solid fuels such as wood is increasing as heating technology and the availability of good quality fuel improves. In some areas, smokeless coal is often the only solid fuel used. In Ireland, peat briquettes are used for home heating. They are also used to start a coal fire. Solid fuels are contrasted with liquid fuels and gaseous fuels. ==Coal reserves== The amount of coal worldwide is approximately 1 trillion metric tons while more are still left over in unknown areas. United States currently holds the majority of coal and bituminous reserves while Russia comes in second, and China follows behind in third. The United States currently holds around 400 years of coal in now established reserves, which are currently in use.〔(and Burgh. (2008). Energizing Our Future: Rational Choices For The 21st 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「solid fuel」の詳細全文を読む スポンサード リンク
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