What is the definition of Autoignition Temperature (AIT)?

The concept of Autoignition Temperature (AIT) refers to the minimum temperature at which a fuel must be heated for combustion to occur without the presence of an external ignition source, such as a flame or spark. This characteristic is crucial for understanding fire behavior and the risks associated with different materials.

In this context, the AIT identifies a specific thermal threshold; once this temperature is reached, the fuel can ignite spontaneously in the right conditions. This definition helps firefighters and safety personnel assess risks associated with fire hazards, storage, and transportation of flammable materials.

Understanding AIT is essential for proper safety protocols and preventing unintentional ignition in various scenarios, such as industrial processes and storage facilities. This definition is distinct from other options, which do not accurately capture the specific meaning of autoignition in combustion science.