Fuels and Combustion
Fossil fuels mean

Solid fuels
Those fuels which are found in the crust of earth
Liquid fuels
Premature fuels with low calorific value

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Fuels and Combustion
Fixed carbon in coal is defined as

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

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