What is autoignition?

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Multiple Choice

What is autoignition?

Explanation:
Autoignition means ignition that happens without an external ignition source: the fuel-air mixture reaches its ignition temperature due to internal heat or heat from the surroundings, without a spark or flame being present. This can occur from hot surfaces, heat from compression, or chemical heat buildup, so the fire starts on its own rather than from a separate ignition event. The other ideas describe ignition that needs a separate flame or spark, or describe ignition caused by friction, which are not the defining feature of autoignition.

Autoignition means ignition that happens without an external ignition source: the fuel-air mixture reaches its ignition temperature due to internal heat or heat from the surroundings, without a spark or flame being present. This can occur from hot surfaces, heat from compression, or chemical heat buildup, so the fire starts on its own rather than from a separate ignition event. The other ideas describe ignition that needs a separate flame or spark, or describe ignition caused by friction, which are not the defining feature of autoignition.

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