👉 In physics and chemistry, autoignition is a reaction where a gas or a liquid spontaneously ignites due to an internal heat source such as a spark. This type of autoignition occurs when the temperature of the substance increases without external ignition, often because it has enough energy to ignite itself spontaneously. The term "autoignition" refers to the spontaneous combustion of a substance that is not intentionally ignited or heated, and typically requires external sources like sparks or a heat source to initiate the reaction.
