a. Applied to prepared coal as for analysis, and being the pure coal substance considered altogether apart from extraneous or adventitious material (moisture and mineral impurities), which may by accident or through natural causes have become associated with the combustible organic substance of the coal. AGI
b. The pure or actual coal substance as derived from taking into consideration the corrected ash. The differentiation between the noncoal substance of a sample being analyzed and the coal itself. It is expressed by the formula: Unit coal = 1.00 - (W + 1.08 A + 0.55 S), where W = water, A = ash, and S = sulfur. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms












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