Absorbance

{
  "id": "MLC-T-CHM-000059",
  "term": "Absorbance",
  "field": "Chemistry",
  "definition": "A measure of the amount of light absorbed by a sample as it passes through a medium. It is defined as the logarithm to the base 10 of the ratio of the incident radiant power to the transmitted radiant power. Absorbance is a dimensionless quantity and is directly proportional to the concentration of the absorbing species and the path length of the light through the sample, as described by the Beer-Lambert law.",
  "synonyms": [
    "extinction",
    "optical density"
  ],
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "attenuance",
    "luminescence",
    "radiant power",
    "scattering"
  ],
  "references": [
    "Green Book, 2nd ed., p. 32 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/absorbance/"
}