Fire tetrahedron: Heat, fuel, oxygen, sustained chemical reaction. Remove one and the fire goes out. On a smaller scale, one can picture it like this. Water gets sprayed on fire in a house. The expansion of water to steam is 1:1700. That is, one cubic foot of water becomes 1700 cubic feet of steam. The function of the steam is to cool the heat and hopefully drop it to a temperature that is below the ignition point of whatever is burning. Thanks to Ray Bradbury, the whole world knows that the ignition point of paper is 451 degrees F. Keep it at 450 degrees and it won't flare up and burn. Flashover is a phenomena that occurs in less than 1 1/2 seconds. Literally, everything that can burn bursts into flame in that 1 1/2 seconds. It's a killer, because from the middle of even a small room, no one will get to the point of egress.

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"In addition to ignition temperature, other properties associated with the flammability of a liquid are its flash point, flammable range, and vapor density. The flash point is the temperature at which a flammable liquid vaporizes and is therefore able to ignite. Liquids with a flash point under 40 °C are considered combustible liquids. Gasoline has a flash point of about -45 °C. The flammable range of a liquid is the ratio of the flammable liquid to air that would create a volatile mixture. The flammability range of gasoline is between 1.4 and 7.6%. If the ratio of gasoline to air is less than 1.4%, then the mixture is to thin to burn. The mixture cannot burn when it contains more than 7.6% gasoline because it is too rich to burn. The vapor density is the weight of a vapor relative to the weight of air. The vapor density of gasoline is heavier than air and therefore will sink when in air."

Just some food for thought.