Lab glossary
Absorbance (A)
A measure of how much light a sample absorbs: A = log₁₀ (I₀ / I). It has no units and is proportional to concentration within the linear range.
- Also: optical density
- Also: OD
Where you will meet this term
- InstrumentUV-Visible Spectrophotometer
- InstrumentFourier Transform Infrared (FTIR) Spectrometer
- InstrumentHigh-Performance Thin-Layer Chromatography (HPTLC)
- InstrumentAtomic Absorption Spectrophotometer (AAS)
- InstrumentFluorescence Spectrophotometer (Spectrofluorometer)
- InstrumentNear-infrared (NIR) spectrometer
- InstrumentEndotoxin (LAL) reader
- InstrumentTotal Organic Carbon (TOC) Analyser
- Test methodIdentification by UV