The highest grade of coal,in terms of heat value per unit weight is

Name: The highest grade of coal,in terms of heat value per unit weight is
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Anthracite is the highest grade of coal with the highest heat value per unit weight. It is very hard and black, with a high carbon content and low moisture and impurities. Peat is the lowest grade of coal and has the lowest heat value. Lignite and bituminous are lower grades than anthracite but higher grades than peat.

The Highest Grade of Coal,in Terms of Heat Value Per