A flame is just the photons that you see, which are given off by hot gas and/or plasma. So in general, you could say that a flame is just hot gas and/or plasma that’s so hot that it starts emitting photons in the visible part of the spectrum. There are multiple ways to get a gas and/or plasma that hot, one of which is to combust something with oxygen in the air. This releases heat which then continues the combustion without any further intervention.
Latest Answers