the sample. The term "internal absorbance" is sometimes used to describe beam attenuation caused by absorption, while "attenuance" or "experimental absorbance" can be used to emphasize that beam attenuation can be caused by other phenomena.

History and uses of the term absorbance

Beer-Lambert law

The roots of the term absorbance are in the Beer-Lambert law (or Beer's law). As light moves through a medium, it will become dimmer as it is being "extinguished". Pierre Bouguer

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