Question

Which type of fuels does not produce flame

Answer 1

Coal, Invisible propane gas flows, unlit, from a torch. On hitting the rhodium-studded ceramic honeycomb from a catalytic converter, it burns without flame, heating the ceramic red-hot. To a chemist, burning means the rapid combination of a fuel with oxygen, called oxidation.

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Answer 2

certain substances like coal do not vapourise hence it doesnt produce flame