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Medical Term:

Beer-Lambert law

Pronunciation: bēr lam′bert

Definition: the absorbance of light is directly proportional to the thickness of the media through which the light is being transmitted multiplied by the concentration of absorbing chromophore; A = εbc where A is the absorbance, ε is the molar extinction coefficient, b is the thickness of the solution, and c is the concentration.

[August Beer, Johann Heinrich Lambert]