A fire propagates because during burning -

Ignition

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A portion of heat released is utilised to melt the substance.

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A portion of heat released is utilised to vapourise the substance.

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A portion of heat released is utilised to maintain the substance.

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Solution

The correct option is A Ignition
For a fire to sustain, it is important that the temperature of the combustible material should be maintained above its ignition temperature. This automatically happens, as a portion of heat energy released during burning will get absorbed by the burning substance and its temperature will stay well above its ignition temperature.

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