The solid combustible residue left after the moisture and volatile matter have been driven off by heating. In the proximate analysis, it is calculated by subtracting the sum of moisture, ash and volatile matter from 100 percent. (See proximate analysis)
The carbonaceous residue less the ash remaining in the test container after the volatile matter has been driven off in making the proximate analysis of a solid fuel.
The solid residue, other than ash, remaining after the volatile matter has been liberated from coal during combustion