Fuels and Combustion
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in

Air
Oxygen
Either A or B
Either A or C without gain or loss of heat

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Fuels and Combustion
The weathering index of a coal

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

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