Beer-Lambert Law: Absorbance 2.0, ε = 2000, 5 cm Path
Calculate Beer-Lambert concentration with absorbance 2.0, molar absorptivity 2000 L/mol·cm, and a 5 cm path length.
How to use this tool
- Enter absorbance a, molar absorptivity ε, concentration c and path length l in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your absorbance a and the full breakdown beneath it.
This Beer-Lambert preset uses a longer 5 cm path length and moderate molar absorptivity to demonstrate the effect of path length on measured absorbance.
Frequently asked questions
- What is molar absorptivity?
- Also called the molar extinction coefficient (ε), it is a measure of how strongly a substance absorbs light at a given wavelength. Units: L/(mol·cm).
- When does Beer-Lambert law break down?
- At high concentrations (above ~0.01 mol/L) due to molecular interactions, or when the light source is not monochromatic.