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Equivalent spherical diameter : ウィキペディア英語版
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.〔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〕
According to the IUPAC definition,〔"(Equivalent diameter )". IUPAC. ''Compendium of Chemical Terminology'', 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. . Term: .〕 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==

* Hydraulic diameter
* Shape factor
* Stokes radius

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