Transmittance

{
  "id": "MLC-T-CHM-012257",
  "term": "Transmittance",
  "field": "Chemistry",
  "definition": "The fraction of incident electromagnetic radiation that passes through a sample. It is defined as the ratio of the radiant power transmitted by the sample to the radiant power incident upon it. This quantity is dimensionless and ranges from 0 to 1, or 0% to 100%.",
  "synonyms": [
    "transmission factor"
  ],
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "Beer-Lambert law",
    "absorbance",
    "attenuance",
    "radiant power"
  ],
  "references": [
    "Green Book, 2nd ed., p. 32 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)",
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2281 (https://doi.org/10.1351/pac199668122223)",
    "PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 996 (https://doi.org/10.1351/pac199668040957)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/transmittance/"
}