Fuels and Combustion
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

Friability & oxygen content
Caking index
Yield of carbonised products
Calorific value

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Fuels and Combustion
Fixed carbon in coal is defined as

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

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