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The existence of walls and a ceiling changes the way the heat transfer modes affect the growth of the fire.
The development of a fire in a room has several stages.
In this stage, the rate of burning depends on the amount of fuel left and the flow of air to the room.
Eventually, all contents will burn out and there will be no more fuel to feed the fire.
So, heating a solid does not necessarily lead to combustion.
Combustion will only occur when the gas is ignited.
Flames are the visible manifestation of this reaction between a gaseous fuel and oxygen.
If the fuel is a solid or liquid, there is first a gasification process as it is heated.
Fire can be described as “a process of combustion characterised by the emission of heat accompanied by smoke and flame” (Malhotra, 2001).
Combustion is a series of very rapid chemical reactions between a fuel and oxygen (usually from the air), releasing heat and light. For combustion to occur heat and a fuel source must all be present and the removal of one of these will terminate the reaction.