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Javier730 wrote:

bdgyeah wrote:Took a college course once where a professor extinguished a lit cigarette in cup full of gas. A cigarette burning by itself (not inhaling) does not burn hot enough to ignite gasoline. Just useless knowledge.

but it's the fumes that can ignite easily.

I have observed a shop teacher quenching white hot steel in a can of gasoline. The can was brim full. The object was gasoline is not flammable, the vapor is. Then he did it in a quart can with about a quarter cup of gasoline in it that had been siting there from the start of the demonstration, it went whoosh. The object being, when you have a gasoline vapor that is the right amount of air it is very flammable.