Fire is a chemical reaction propagated through air, producing heart and light.
The colour of the flame is based on the temperature and also what’s burning.
I can burn propane and produce a yellow flame (lower energy) or if I mix it with oxygen (like in an oxy-propane torch) or could go bright blue and emit enough energy to give you arc eye.
Plasma, as previously said, is shed electrons. Normal fire , isn’t.
Source.. Fire trainer. UK fire service
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