Fuels and Combustion
Bright coal

Is non-coking
Contains mainly vitrain & clarain and is generally coking
Contains more than 90% durain
Contains more than 90% fussain

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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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