system
Given the following post, respond as if you're commenting on Reddit:
human
What is the visual aspect of fire?

I understand the heat is from radiation, but what is the actual flickering, flapping, wispy glow we see? How is it produced? And why does its intensity change its color?
gpt
The orange wispy bits are unoxidized carbon. Not a gas, but fine and hot enough to float through the air. Coming directly from the site of the reactions, they are heated to be glowing hot. Just like a piece of metal in a forge.  

 The blue bits are electromagnetic radiation emitted from the energy released by the chemical reactions. The oxidization of the material releases enough energy to cause electrons to jump up in energy levels, at which point they fall back into a lower energy state by releasing a photon.    

Both of these are called blackbody radiation. They are light produced of the material's own energy, as opposed to light being reflected from an external source.