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Particle size
Particle size is a notion introduced for comparing dimensions of solid particles (''flecks''), liquid particles (''droplets''), or gaseous particles (''bubbles''). The notion of particle size applies to
colloidal particles, particles in ecology, particles present in granular material (whether airborne or not), and particles that form a granular material (see also grain size).
==Expressions for particle size==
The particle size of a spherical object can be unambiguously and quantitatively defined by its diameter. However, a typical material object is likely to be irregular in shape and non-spherical. The above quantitative definition of ''particle size'' cannot be applied to non-spherical particles. There are several ways of extending the above quantitative definition to apply to non-spherical particles. Existing definitions are based on replacing a given particle with an imaginary sphere that has one of the properties identical with the particle.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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