The human body depends on food for life and strength similarly the civilized world depends on fuel much. Modern transportation and most of the electric power are provided by fuels which the people depend upon. Industrialized world would not exist today without fuels. Food and Fuel are similar in many aspects .The minerals are found in the earth as the end product of organic matter left behind by plants and animals and buried millions of years ago, these are the carbon compounds and are known as fossil fuels. Combining with oxygen in a chemical reaction that produces heat which causes the fuels to be burned in air. This heat can then be converted into electrical or mechanical energy. Fossil fuels are consumed when they are burned. Thus, they are a nonrenewable energy resource. To raise the temperature of one kilogram of water by one degree Centigrade, One kilocalorie is the amount needed. Fuels may be liquids, solids, or gases. Coal is the most important of the solid fuels. Industrialized nations use it primarily for electric power production with smaller amounts required for heating and for metallurgical processes. Refined products of petroleum, including gasoline, kerosene, diesel oil, and others are the principal liquid fuels.