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Absorbance
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===Attenuation coefficient=== Absorbance of a material is also related to its ''[[Attenuation coefficient|decadic attenuation coefficient]]'' by <math display="block">A = \int_0^l a(z)\, \mathrm{d}z\,,</math> where * {{mvar|l}} is the thickness of that material through which the light travels, and * {{math|''a''(''z'')}} is the ''decadic attenuation coefficient'' of that material at {{mvar|z}}. If ''a''(''z'') is uniform along the path, the attenuation is said to be a ''linear attenuation'', and the relation becomes <math display="block">A = al.</math> Sometimes the relation is given using the ''[[molar attenuation coefficient]]'' of the material, that is its attenuation coefficient divided by its [[molar concentration]]: <math display="block">A = \int_0^l \varepsilon c(z)\, \mathrm{d}z\,,</math> where * {{mvar|Ξ΅}} is the ''molar attenuation coefficient'' of that material, and * {{math|''c''(''z'')}} is the molar concentration of that material at {{mvar|z}}. If {{math|''c''(''z'')}} is uniform along the path, the relation becomes <math display="block">A = \varepsilon cl\,.</math> The use of the term "molar absorptivity" for molar attenuation coefficient is discouraged.<ref name=GoldBook />
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