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Flame photometry and atomic absorption spectroscopy are both analytical techniques used to determine the concentration of an element in a sample. Flame photometry measures the intensity of light emitted by an atom when it is excited by a flame, while atomic absorption spectroscopy measures the amount of light absorbed by an atom when it is exposed to a beam of light. Both techniques are based on the principle that each element emits or absorbs light at specific wavelengths, which can be used to identify and quantify the element in a sample.