Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
in internal combustion, I wonder where most of the energy is coming from?
I visualize the CO2/H2O mixture heated by the positive entalpy change, and the internal energy change liberated by the positive entropy change with the more number of gas molecules formed.
I wonder if it isn´t just the heat over the new number of gas moles that prevails.
2 Answers
- 9 years agoFavorite Answer
It is MOSTLY heating of the gas that generates the pressure to move the piston. Remember that air is almost 80% nitrogen, which plays no part in the combustion process. In the usual regime for engines, only part of the oxygen participates in combustion (to limit waste of fuel). Engineers use these simplified models to study these engines. A more detailed presentation is on the Wikipedia page, pretty much like my Physics textbook. The link is for the Otto cycle (for gasoline engines), with similar explanation for the Diesel engine.
- billrussell42Lv 79 years ago
It's coming from the combustion of vaporized gasoline and air, compressed and ignited by the spark plug.
