A rehash of Beer’s law

Beer’s law (1852 by August Beer):
It relates the absorption of light to the properties of the material through which the light is traveling. (http://en.wikipedia.org/wiki/Lambert-Beer_law). That is, how well a student absorbs academic material, per topic, per time, or how much alcohol the liver will take at any specific time.

Beer Lambert Law in Solution

Beer-Lambert Law in Solution

Specifically, it is the physical law that states that the quantity of light absorbed by a substance dissolved in a non-absorbing solvent is directly proportional to the concentration of the substance and the path length of the light through the solution. (http://en.wikipedia.org/wiki/August_Beer).

Beer's Law

A is the measured absorbance (of the brain or liver etc).
ε L.mol-1.cm-1 is molar absorpitivity. The wavelength-dependent absorptivity coefficient, a function of the level/rate of understanding and comprehension, focus, attention and distraction.
l cm is path length of the sample (material),  a function of volume, presentation and pedagogy.
c mol.L-1 is solution/analyte concentration, a function of frequency and/or material concentration.

Then a saturation (can’t take this any more) point might come, or the above law break down, like when a stretched rubber (stomach or liver?) refuses to go back to its original length having been overstretched, thus distended (re: Hookes law of elasticity).


Reference also made to the Android app, Techcalc, by http://www.roamingsquirrel.com/calculator.html

Pictures from Wikimedia commons (File:Beer Lambert Law in Solution.jpg, File:Beer’s Law.png).