Fuels and Combustion
Coalification means the

Process of conversion of lignite into anthracite
Complete combustion of coal
Underground gasification of coal
Direct hydrogenation of coal

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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 a measure of its caking tendency
Is related to its calorific value
Gives an idea of the fusion temperature of ash

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