air-dry loss

n
in coal, the loss in mass, expressed as a percentage, resulting from each air-drying stage or the sum of all sequential air-drying stages in which the results from each stage are adjusted to the as-received basis.
DISCUSSION — Air-dry loss is neither a standard state nor a characterisetic property of a coal. Air drying only removes water that can evaporate at or near ambient laboratory conditions, leaving in the coal some fraction of the inherent moisture that is more tightly bound in the pores (residual moisture). Different laboratory environments or different drying temperatures or both will result in significant differences in air-dry loss and residual moisture. D3302

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

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