Equivalent spherical diameter

In science, the equivalent spherical diameter (or ESD) of an irregularly shaped object is the diameter of a sphere of equivalent volume.[1]

According to the IUPAC definition,[2] the equivalent diameter of a non-spherical particle is equal to a diameter of a spherical particle that exhibits identical properties (e.g., aerodynamic, hydrodynamic, optical, electrical) to that of the investigated non-spherical particle. For particles in non-turbulent motion, the equivalent diameter is identical to the diameter encountered in the Stokes' law.

See also


  1. Jennings, B. R. and Parslow, K. (1988) Particle Size Measurement: The Equivalent Spherical Diameter. Proceedings of the Royal Society of London. Series A 419, 137-149
  2. IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version:  (2006) "equivalent diameter". doi:10.1351/goldbook.E02191
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