this post was submitted on 08 Jun 2024
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Just in case anyone actually wants to know: fire is not plasma, which is ionised (electrons not bound to the nucleus) matter, but simply smoke particles hot enough to glow.
Fire is much more complex than that. Fires appearance comes from:
Fire is an active chemical reaction. It's a transition between often solid or liquid, sometimes gaseous, fuels, into gaseous products, all while undergoing a chemical reaction. It's not a state of matter, states of matter concern the phase of equilibrium conditions, and fire is decidedly not in equilibrium.
This needs an ELI5 version...
Hot things glow, some chemical reactions glow, fire does both, mostly the latter especially for cooler fires.