Fuels and Combustion
In high temperature carbonisation of coal compared to low temperature carbonisation

Aromatic content of tar is low
Calorific value of the coke oven gas is lower
H₂ content in the coke oven gas is more
Yield of ammonia is less

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Fuels and Combustion
The weathering index of a coal

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

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