What does the term "Convection" refer to in the context of fire spread?

In the context of fire spread, "Convection" refers to the process where heated air, which can become superheated due to proximity to flames or hot surfaces, rises and carries heat with it. This can lead to the ignition of other materials that are nearby as the warm air transfers heat to those materials. When air is heated, it expands and becomes less dense, allowing it to rise. As this air moves, it can create currents that spread heat throughout an area, bringing nearby combustible substances closer to their ignition temperature.

This process is crucial in understanding how fire spreads within a given environment because it not only involves heat transfer but also influences how quickly and widely a fire can propagate. Factors such as wind, the layout of a space, and the presence of other materials can further affect convection currents, making it an essential concept in both fire management and safety.