# How does absorbance depend upon concentration?

Jul 8, 2017

Well is not the expression, $A = \epsilon b c$?

#### Explanation:

Where $A = \text{absorbance}$, a dimensionless quantity......

And $\epsilon = \text{molar extinction coefficient}$

And $b = \text{path length of cell}$

And $c = \text{concentration.........}$

Given that $b$ and $c$ have units of $c m$, and $m o l \cdot {L}^{-} 1$, should not $\epsilon$ have units of $c {m}^{-} 1 \cdot L \cdot m o {l}^{-} 1$. And thus as concentration grows, absorbance should increase proportionally up to a point........