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Particle size (general)
Additional recommended knowledgeHowever, a typical material object is likely to be irregular in shape. This causes ambiguity in definition of particle size. Existing definitions are based on replacent of a given particle with imaginary sphere that has one of the properties identical with the particle.
Another complexity in defining particle size appears for particles with sizes below micron. When particle becomes that small, thickness of interface layer becomes comparable with the particle size. As a result, position of the particle surface becomes uncertain. There is convention for placing this imaginary surface at certain position suggested by Gibbs and presented in many books on Interface and Colloid Science^{[1]}, ^{[2]}, ^{[3]},^{[4]},^{[5]}, ^{[6]}. Definition of the ensemble particle size presents another problem. Real systems are practically always polydisperse, whch means that particles in encemble have different sizes. The notion of particle size distribution reflcts this polydispersity. There are still often a need of a certain average size for encemble. There are several different way of introducing such size.
There are several methods for measuring particle size. Some of them are based on light, other on ultrasound, or electric field, or gravity, or centrifugation. They are briefly described in the section particle size distribution. References

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Particle_size_(general)". A list of authors is available in Wikipedia. 