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1 Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.2  AAS is used particularly for detecting the concentrations of metal ions in solutions. Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.
AAS Rule. The Angle-Angle-Side (AAS) Rule states that. If two angles and a non-included side of one triangle are equal to two angles and a non-included side of another triangle, then the triangles are congruent. (This rule may sometimes be referred to as SAA).