Question

A fire propagates because during burning:

• A. A portion of heat released is utilised to maintain the ignition temperature.
• B. A portion of heat released is utilised to melt the substance.
• C. A portion of heat released is utilised to vapourise the substance.
• D. A portion of heat released is utilised to decrease the ignition temperature of the substance.

Answer 1

The correct option is A

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.