in coal, that water in and on coal assayed in accordance with standard test methods in which the final step is the measurement of mass loss from a coal sample heated to 104 to 110°C at specified conditions of residence time, atmosphere, sample mass, and equipment configuration.
DISCUSSION — All coals are porous and, in their natural state, the pores are essentially full of water (inherent moisture). When coal is mined and processed, water may also be present on the surface of the pieces of coal (surface moisture). Water formed by the thermal decomposition of the organic fraction of coal or associated mineral matter is not considered part of the moisture content of coal. In some coals, a very small portion of the assayed mass loss may be volatile hydrocarbons and dissolved or adsorbed gases. ASTM-standardized procedures for the determination of moisture in coal are designed for commercial purposes to facilitate trade and resource evaluation; they may not be adequate for research or other activities with different requirements. D3302, D3173, D2961
- inherent moisture - pore moisture - residual moisture - surface moisture - total moisture

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.


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