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Vocabulary Term Details


Definition (

In spectroscopy, the absorbance (also called optical density of a material is a logarithmic ratio of the radiation falling upon a material, to the radiation transmitted through a material. Absorbance measurements are often carried out in analytical chemistry. (Wikipedia)

Preferred Units: N/A

Scope Note:

Broader TermsNarrower TermsRelated Terms
Optical properties

This term is used for the following terms: 
Optical density
Transmittance (optical)

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