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Thermal coal or steaming coal is burned for steam to run turbines to generate electricity either to public electricity grids or directly by industry consuming electrical power (such as chemical industries, paper manufacturers, cement industry and brickworks).
Heats of combustion (the energy released when a certain amount of a substance burns in oxygen) have practical importance. A buyer of coal is more interested in the heat of combustion than in the actual weight of the coal. A dietician is interested in knowing the number of calories that are obtained from various foods. Review and/or review Sections 3-4.2, 3-5.1, 5-1, 5-2.1, 6-2, 6-3 in your textbook.