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Question

A fire propagates because during burning -


A
Ignition
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B
A portion of heat released is utilised to melt the substance.
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C
A portion of heat released is utilised to vapourise the substance.
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D
A portion of heat released is utilised to maintain the substance.
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Solution

The correct option is B

A portion of heat released is utilised to maintain the ignition temperature.


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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