residual moisture

n
that moisture remaining in the sample after air drying.
DISCUSSION — Residual moisture is neither a standard state nor a characteristic property of a coal.Air drying only removes water that can evaporate at or near ambient laboratory conditions leaving in the coal water that will not evaporate at those conditions. Different laboratory environments or different drying temperature or both will produce significant differences in air-dry loss and residual moisture. Residual moisture is assayed by determining the mass lost from drying the sample at 104 to 110°C at specified conditions of residence time, atmosphere, particle size, sample mass, and equipment configuration. D3173, D3302

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

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