Abstract
The size of particles is an extremely important factor in their behavior. Particulate technology is a complex subject, and the major factor in this complexity is the variety of the physical and chemical properties of the particles. Particles can be solid or hollow, or filled with gas. The surface structure, porosity, specific gravity, can have a profound effect on their behavior. Their ability to absorb moisture or to react with other chemicals in the environment or with each other can make handling very difficult, as well as affect the size of the particles. Most particles are not regularly shaped so it is not possible to describe the size uniquely. To overcome this problem, the standard procedure is to use the diameter of equivalent spheres. However, an irregularly shaped particle can have an almost limitless number of different equivalent spheres depending on the particular parameter chosen for equivalence.
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