Why do flames have different colors?
There is a relationship between the fuel burned and the color.
An explanation of this is that electrons in the atoms of the fuel used is excited due to eating (energy). They move from ground state to higher energy level and when they return they emit photons of different wavelengths. Each wavelength corresponds to a certain
color.
Sodium emits orange light when burned. If you see blue in wood flames, it is from(not "from" use, "because of") the burning of carbon and hydrogen. Red comes from lithium and copper will make green or blue flames when burned.
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