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the ignition point of fuel or the flashpoint if that is what your asking can be found with many instruments i find that the grabner miniflash system is the most reliable, basically though it depends on what type of fuel your after im guessing your talking about petrol so the flashpoint would be approx -38.5*c to find the flashpoint of petrol you would have to cool the fuel to below -38 *c then slowly heat the fuel until it produces enough vapour to flash when in contact with a naked flame

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Q: How do you determine ignition point of fuel?
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