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No - petrol combustion is a rapid oxidisation which is an exothermal reaction... it creates heat, and heated air expands. The fuel (petrol) is made of a composition mostly comprising hydrogens, carbons, a little sulphur and nitrogen. Air contains mostly nitrogen, and about 1/5th of air is oxygen capable of causing oxidation in the right circumstance.

The gasoline/petrol fuel is changed in this chemical reaction, broken into component parts and reforms as Carbon Monoxide, Carbon Dioxide, oxides of sulphur, oxides of nitrogen and a fair bit of oxides of hydrogen... or water vapour (the only non-nasty part of the exhaust) although this water is superheated steam at that point.

A poorly tuned petrol engine will also spit out unburned petrol as a vapour only where not enough oxygen was present at ignition. That is the only part of petrol that evaporates and only when it is not working right.

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Q: When gasoline is burned in an engine does it evaporate?
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