![]() ![]() The molar extinction coefficient is given as a constant and varies for each molecule. \(\epsilon\) is the molar extinction coefficient or molar absorptivity (or absorption coefficient),.\(A\) is the measure of absorbance (no units),. ![]() For this reason, Beer's Law can only be applied when there is a linear relationship. Figure 5: Transmittance (CC BY-4.0 Heesung Shim via LibreTexts)īeer-Lambert Law (also known as Beer's Law) states that there is a linear relationship between the absorbance and the concentration of a sample. The length \(l\) is used for Beer-Lambert Law described below. Figure 5 illustrates transmittance of light through a sample. ![]() With the amount of absorbance known from the above equation, you can determine the unknown concentration of the sample by using Beer-Lambert Law. Where absorbance stands for the amount of photons that is absorbed. ![]()
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