Fuels and Combustion
A coal having higher volatile matter content, has lower

Smoking tendency on burning
Chance of catching fire during storage in open space
Coke oven gas yield on carbonisation
Ignition temperature

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Fuels and Combustion
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

Is more difficult to ignite and produces a shorter flame
Is less liable to spontaneous combustion on storage
None of these
Requires smaller combustion space and less secondary air

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