Particle size

{
  "id": "MLC-T-CHM-013375",
  "term": "Particle size",
  "field": "Chemistry",
  "definition": "A measure of the physical dimensions of solid or liquid particles suspended in a gas, such as those constituting an aerosol. Because atmospheric particles are often irregularly shaped, their size is expressed as an equivalent diameter, which relates a particle's property (like aerodynamic behavior or volume) to that of a uniform sphere. Particle size distributions are used to classify aerosols, with particles under 2.5 micrometers (PM2.5) being a major focus of air quality regulation.",
  "subject": "Chemistry and the Environment",
  "see_also": [
    "aerosol",
    "equivalent diameter"
  ],
  "references": [
    "PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2205 (https://doi.org/10.1351/pac199062112167)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/particle-size/"
}