Aerodynamic diameter

{
  "id": "MLC-T-CHM-000308",
  "term": "Aerodynamic diameter",
  "field": "Chemistry",
  "definition": "The size of an airborne particle expressed as the diameter of a sphere of unit density (1 g/cm³) that would fall through still air at the same terminal speed. Because it reflects how a particle actually moves in air, it puts irregular particles of differing density and shape on one scale. PM10 and PM2.5 are defined as particles whose aerodynamic diameter is no larger than 10 and 2.5 micrometres.",
  "subject": "Chemistry and Human Health",
  "references": [
    "PAC, 2007, 79, 1153. 'Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)' on page 1162 (https://doi.org/10.1351/pac200779071153)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/aerodynamic-diameter/"
}