The evaporation rate would depend on a lot of conditions and it would be individual to each case with such a volatile liquid a small change in wind , air pressure or temperature would give different results.
I would imagine it evaporates at most normal temperatures throughout the world which is why you should not smoke cigarettes at petrol stations.
Flash point is the temperature it gets really dangerous to smoke cigarettes at petrol stations.
evaporation is a strange subject as it contains lots of fluid mechanics.
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