Title: aerodynamic diameter
Long Title: IUPAC Gold Book - aerodynamic diameter
DOI: 10.1351/goldbook.15449
Status: current

Definition
Diameter of a spherical particle with relative density equal to unity that has the same settling velocity in air as the particle in question.

Source
- PAC, 2007, 79, 1153. 'Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)' on page 1162 (https://doi.org/10.1351/pac200779071153)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/15449/html
- json: https://goldbook.iupac.org/terms/view/15449/json
- xml: https://goldbook.iupac.org/terms/view/15449/xml

Citation: Citation: 'aerodynamic diameter' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.15449
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Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.
Accessed: 2026-06-06T21:46:10+00:00