Beer's law


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Beer's law

[for August Beer], physical law stating that the quantity of light absorbed by a substance dissolved in a nonabsorbing solvent is directly proportional to the concentration of the substance and the path length of the light through the solutionsolution,
in chemistry, homogeneous mixture of two or more substances. The dissolving medium is called the solvent, and the dissolved material is called the solute. A solution is distinct from a colloid or a suspension.
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; the law is sometimes also referred to as the Beer-Lambert law or the Bouguer-Beer law. Beer's law is commonly written in the form Acl, where A is the absorbance, c is the concentration in moles per liter, l is the path length in centimeters, and ε is a constant of proportionality known as the molar extinction coefficient. The law is accurate only for dilute solutions; deviations from the law occur in concentrated solutions because of interactions between molecules of the solute, the substance dissolved in the solvent.

Beer's law

[′bā·ərz ‚lȯ]
(physical chemistry)
The law which states that the absorption of light by a solution changes exponentially with the concentration, all else remaining the same.
References in periodicals archive ?
The ability to generate Beer's Law Plot also indicated that this qualitative test could possibly become a quantitative test; however, the amount of culture needed and the time to perform the ferric hydroxamate test were cumbersome.
It would both simplify measurement of the topcoat systems and allow better system modeling if these layers could be measured separately and combined using Beer's Law to obtain the transmittance of the total topcoat system.
Written in Commodore Basic for a Commodore 64 or Plus/4, the program can be altered or expanded for any instrument or group of tests to which the matrix mixing protocol applies--that is, any analyzer that follows Beer's law.