The ______ _______ of a substance is the minimum temperature to which the fuel in air must be heated to self-sustained combustion without initiation from an independent ignition source.

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Autoignition temperature is the temperature at which a substance will ignite in air without any external ignition source. The description in the prompt—the minimum temperature to which the fuel in air must be heated to achieve self-sustained combustion without an independent ignition source—matches this exactly.

A flash point is different: it’s the lowest temperature at which enough vapor can be released to form an ignitable mixture, but an ignition source (like a spark or flame) is still required to start burning. The boiling point relates to when a liquid boils and is not about ignition. Some contexts use ignition temperature, but the standard term for spontaneous ignition without external heat is autoignition temperature.