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| #REDIRECT [[absorption coefficient]] | | #REDIRECT [[Absorption coefficient]] |
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| {{Term
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| |Display title=absorption coefficient
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| |Definitions={{Definition
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| |Num=1
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| |Meaning=A measure of the [[extinction]] due to [[absorption]] of [[monochromatic radiation]] as it traverses a medium.
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| |Explanation=Usually expressed as a [[volume absorption coefficient]], ''k''<sub>''v''</sub>, with units of reciprocal length (i.e., area per unit volume), but also as a [[mass absorption coefficient]], ''k''<sub>''m''</sub>, with units of area per unit mass. The two are related by ''k''<sub>''v''</sub> = ρ''k''<sub>''m''</sub>, where ρ is the [[density]] of the absorber. <br/>''See also'' [[absorption optical thickness]].
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