Fuels and Combustion
Fixed carbon in coal is defined as

The total quantity of carbon present in the coal
Hundred minus the percentage of volatile matter, ash and moisture
That present in volatile matters
The one which is present in the residue after combustion

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Fuels and Combustion
The weathering index of a coal

Is a measure of its size stability, when stored & exposed to weather
Is related to its calorific value
Gives an idea of the fusion temperature of ash
Is a measure of its caking tendency

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