Endless Facts, One Snippet at a Time
The Science of Gasoline and Combustion
- Gasoline is a hydrocarbon blend, mostly made of molecules with 4–12 carbon atoms.
- Combustion releases energy when hydrocarbons react with oxygen to form carbon dioxide and water.
- Octane rating shows how resistant fuel is to knocking, or premature ignition in engines.
- Additives in gasoline improve stability, reduce engine deposits, and cut emissions.
- Incomplete combustion produces carbon monoxide and soot, making engines less efficient and more polluting.
- Catalytic converters clean up by converting harmful byproducts into carbon dioxide, nitrogen, and water.
- Energy density of gasoline is high—about 34 MJ per liter—giving it powerful performance.
- Engine compression influences how effectively gasoline burns and how much power it produces.
- Combustion chemistry involves free radicals that drive chain reactions inside the cylinder.
- Future fuels like bioethanol and synthetic gasoline aim to mimic combustion chemistry with fewer emissions.