The learning library
The why behind the numbers.
Short explanations, established equations and examples you can reproduce. Start wherever your curiosity takes you.
Learn by changing the light.
Explore concentration, path length and transmittance in a live model.
01 / The fundamentals · 2 min
What does absorbance measure? ↗
A useful number for how much a beam changes as it passes through a sample.
02 / The fundamentals · 2 min
Absorbance and transmittance ↗
Move between a logarithmic reading and the fraction of light transmitted.
03 / Working with measurements · 3 min
Using the Beer–Lambert law ↗
Connect absorbance, concentration and optical path length with visible assumptions.
04 / Practical essentials · 2 min
Path length and concentration units ↗
Get centimetres, millimetres, M, mM and µM onto the same scale.
05 / Working with measurements · 3 min
Read a linear calibration curve ↗
Understand the fitted line, its intercept, residuals and inverse estimates.
06 / Practical essentials · 2 min
Dilution factors without the mix-ups ↗
Keep the measured solution and original solution separate in your calculation.
A little practice goes a long way.
Free synthetic standards and a printable worksheet with worked answers.