Emittance

{
  "id": "MLC-T-CHM-003854",
  "term": "Emittance",
  "field": "Chemistry",
  "definition": "A measure of the radiant power emitted per unit area from a surface, often used in the context of thermal radiation. It quantifies the efficiency with which a surface radiates energy compared to a perfect black body at the same temperature. The spectral emittance describes this property as a function of wavelength.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "radiant exitance"
  ],
  "references": [
    "Green Book, 2nd ed., p. 31 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)",
    "ISO 31-05: 1992 (https://www.iso.org/iso/catalogue_detail.htm?csnumber=3635)",
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2239 (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 972 (https://doi.org/10.1351/pac199668040957)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/emittance/"
}