We know that light is produced when a charge particle accelerates.

Fire doesn't have electric and magnetic field so how does light come from a fire?

  • 1
    $\begingroup$ Light is also caused by atomic state transitions $\endgroup$
    – Ben
    Jan 3, 2022 at 14:33
  • $\begingroup$ Pls give detailed but short answer $\endgroup$
    – user324098
    Jan 3, 2022 at 15:00
  • $\begingroup$ You have taken only one way that light can be generated and incorrectly assumed that is the only way. Check out some other ways, e.g., chemiluminescence and triboluminescence. $\endgroup$
    – Ed V
    Jan 3, 2022 at 17:20

2 Answers 2


Fire is really a combustion reaction in which a fuel is oxidided by air oxygen. The two so-called half reactions that take place are:

$$\text{Fu}\to \text{Fu}^{n+}+n \text{e}^-$$ $$\text{O}+2\text{e}^-\to \text{O}^{2-}$$

These electron transfers release energy, known as the Gibbs Free Energy of Combustion, in the form of heat energy.

This heat energy heats up the combustion gases and causes them to emit visible light (as well as IR radiation)

What exactly is the mechanism of radiation emission by the hot combustion gases is explained in great detail here.


  • $\begingroup$ How exactly does a heated gas emit photons? $\endgroup$
    – Ben
    Jan 3, 2022 at 15:44
  • $\begingroup$ Light is combination of electric and magnetic field , where are these fields in fire $\endgroup$
    – user324098
    Jan 3, 2022 at 15:47
  • $\begingroup$ @Ben: I've edited my post. $\endgroup$
    – Gert
    Jan 3, 2022 at 15:49
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    $\begingroup$ @VaibhavTiwari The emission of electromagnetic radiation by atoms/molecules does not require an explanation involving a 'combination of electric and magnetic field'. Transitions of electrons inside said atoms/molecules from one to another energy level adequately explains the emission of EMR. $\endgroup$
    – Gert
    Jan 3, 2022 at 15:53

Light is also produced by atomic transitions. This is when an electron leaves a higher (orbital) state and occupies a lower one. You can see it here:


This is explained more extensively in https://chemistry.stackexchange.com/questions/102280/how-is-the-light-from-a-fire-emitted


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