(a) Carbon content. Coal with a high carbon and hydrocarbon content have a higher heat value.
(b) Presence of volatile matter. The higher the amount of volatile matter, the lower the commercial level of coal.
(c) Amount of moisture. Coals with a high amount of moisture absorb much of the heat when they burn and have a low heat value.
Faimus answered the question on April 19, 2018 at 13:33
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