Autoignition temperatures of liquid chemicals are typically measured using a flask placed in a temperature-controlled oven in accordance with the procedure described in ASTM E659.
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The main mechanism of combustion propagation is of a powerful pressure wave that compresses the unburnt gas ahead of the wave to a temperature above the autoignition temperature.
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Methane, the main component of natural gas, has an autoignition temperature of 580C / 1076F, whereas gasoline and diesel autoignite at approximately 250C and 210C respectively.
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Upon reaching the " threshold " temperature ( autoignition temperature ) the combustion process begins, with the release of heat sufficient to ignite the nearest areas.
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A material may have a relatively low autoignition temperature yet if its flash-point is above the ambient temperature, then the area may not need to be classified.
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Ignition occurs as the temperature of the fuel / air mixture is taken over its autoignition temperature, due to heat generated by the compression of the air during the compression stroke.
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To ignite, the fuel must have a low flash point, but in order to avoid preignition caused by residual heat in a hot combustion chamber, the fuel must have a high autoignition temperature.
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The autoignition temperature of carbon disulfide is below 100 �C ( 212 �F ), so objects such as steam pipes, light bulbs, hotplates and recently extinguished bunsen burners are able to ignite its vapours.
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Diesel is suitable for use in a compressed until it has been heated above the autoignition temperature of the fuel, which is then injected as a high-pressure spray, keeping the fuel-air mix within flammable limits.
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:: ( awesome video, by the way ! ) With the caution that since there isn't any convective transfer of heat away from the once-burning match, it will take some time to cool below its autoignition temperature.
