As a domain expert in the field of combustion and thermodynamics, I can provide a comprehensive explanation to the question of whether fire can burn itself. To understand this, we need to delve into the fundamentals of combustion, the role of heat, and the nature of fire itself.

Combustion Fundamentals
Combustion is a chemical process that involves the reaction of a fuel with an oxidizer, typically oxygen, to produce heat, light, and various reaction products. The process requires three essential components, known as the fire triangle: fuel, oxygen, and heat. Without any one of these elements, combustion cannot occur.

The Role of Heat
Heat is a critical element in combustion. It serves as both an input, which initiates the reaction, and an output, which is produced during the reaction. When a fuel is heated to its ignition temperature, it begins to undergo pyrolysis, a process where the fuel breaks down into simpler substances that can react with oxygen.

The Nature of Fire
Fire is often described as the visible, gaseous part of the combustion process. It is characterized by the emission of light and heat, the production of characteristic flames, and the generation of combustion products. Fire itself is not a separate substance but a phenomenon that occurs when a material undergoes combustion in the presence of oxygen.

Can Fire Burn Itself?
The question of whether fire can burn itself is somewhat paradoxical. Fire, as a manifestation of the combustion process, requires fuel to sustain itself. Once the fuel is consumed, the fire will extinguish unless there is more fuel to continue the reaction. In a sense, fire can be seen as "burning itself" in that it consumes the fuel that is sustaining it. However, without additional fuel, the fire cannot continue to burn indefinitely.

The reference to the carbon catching fire at 450 degrees Celsius is an example of the end stage of combustion where the remaining carbon, which has not yet reacted, ignites. This is a part of the combustion process where the heat generated from the initial reaction is sufficient to ignite the remaining carbon. It is important to note that this does not mean the fire is burning itself in isolation but rather that the heat generated from the initial combustion is facilitating the burning of the remaining fuel.

Self-Sustaining Combustion
In certain conditions, combustion can become self-sustaining. This occurs when the heat generated by the combustion of the fuel is enough to continue the reaction without the need for an external heat source. However, this self-sustaining process still requires a continuous supply of fuel and oxygen.

Extinguishing Fire
Conversely, removing any one of the elements of the fire triangle can extinguish a fire. For example, removing the oxygen supply by smothering the fire or removing the heat by cooling the fuel below its ignition temperature can stop the combustion process.

In conclusion, while it is a common misconception to think of fire as a substance that can burn itself, fire is a process that requires continuous fuel and oxygen to sustain itself. The heat generated during combustion can indeed facilitate further burning of the fuel, but without these essential components, fire cannot continue.

read more >>

When the fire reaches 450 centigrade, the carbon left from the pyrolysis will catch fire and glow as it burns without smoke or flame. It is worth explaining that in the process of combustion, heat is both an input and an output. ... This releases more energy that causes the carbon to burn.read more >>