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The equivalent spherical diameter of an irregularly shaped object is the diameter of a sphere of equivalent geometric, optical, electrical, aerodynamic or hydrodynamic behavior to that of the particle under investigation.[1][2][3]
The particle size of a perfectly smooth, spherical object can be accurately defined by a single parameter, the particle diameter. However, real-life particles are likely to have irregular shapes and surface irregularities, and their size cannot be fully characterized by a single parameter.
The concept of equivalent spherical diameter has been introduced in the field of particle size analysis to enable the representation of the particle size distribution in a simplified, homogenized way. Here, the real-life particle is matched with an imaginary sphere which has the same properties according to a defined principle, enabling the real-life particle to be defined by the diameter of the imaginary sphere.
The principle used to match the real-life particle and the imaginary sphere vary as a function of the measurement technique used to measure the particle.
- ^ 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
- ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "equivalent diameter". doi:10.1351/goldbook.E02191
- ^ Merkus, Henk G. (2009). Particle size measurements : fundamentals, practice, quality. Dordrecht: Springer. ISBN 978-1-4020-9016-5. OCLC 318545432.