The reason for atomic emission to be more sensitive to flame instability than atomic absorption or fluorescence needs to be explained.
Spectral lines help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range as compared to the frequencies nearby.
Fluorescence is the process by which a substance absorbing electromagnetic radiation emits light.
In a defined space, the amount of a substance gives its concentration. A capacity of substance to absorb specific wavelength light gives its absorbance.
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