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When methane levels exceed the upper explosion threshold or fall below the lower limit, the combustion is gentle due to a lack of either methane or oxygen. Within the explosion range, na izany aza, the methane-to-oxygen ratio is optimal for combustion, causing a fierce blaze.

If at this moment, the chemical reaction takes place in a restricted area and demands significant heat release, the resulting gases expand swiftly, culminating in an explosion.