What is the autoignition temperature (AIT)?

The autoignition temperature (AIT) is defined as the lowest temperature at which a gas-air mixture will ignite in the absence of an ignition source. This means that at this specific temperature, the mixture has reached a point where it is capable of self-igniting without any external spark or flame. Understanding the AIT is crucial for fire investigators and safety professionals as it helps in assessing the risk of unintended ignition in various environments and conditions.

In practical applications, knowing the AIT allows for better safety protocols in handling and storing flammable substances, as it identifies the temperature threshold that must not be exceeded to prevent accidental ignition. This concept is particularly important in industries dealing with volatile chemicals, fueling stations, and manufacturing processes where flammable vapors may accumulate.