What causes the luminosity of the flame?

Answer 1

Flames are luminous for the reason, that they emit atoms, this  process of atom emission occurs  within the combustion zone. Bits of sodium (yellow-orange, the most common color of a flame) will be atomized and excited into an upper atomic electronic state in the flame. When these excited states relax back to their ground state, intense colored light is emitted.

 

Answer 2

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