ignition of fuels
Ignition of fuel vapors in air is very hard to define, it is strongly effected by the conditions of the sample, ie the size of the volume, the shape and construction of the container and the nature of the heat source.
Ignition of vapors is much more difficult with general heating vs a small concentrated heat source like a spark, flame or hot surface.
The minimum ignition temperature of methanol in air is 725 deg F, ethanol is 689 deg F, and gasoline is 824 deg F.
Larry
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