Abstract
A powder is that state of a solid which consists of finely divided material and is characterized by physical and chemical properties which differ from those of the bulk material. Physical properties characteristic of fine particles are often encountered in the field of solid state physics. For example, the interaction between a particle and an electromagnetic wave such as light depends on the ratio of the wavelength to the particle diameter. When the particle diameter is less than the wavelength, the wave undergoes pronounced scattering. Similarly, when a ferromagnetic material is finely pulverized until the particle diameter is less than that of a single domain, there is a marked change in its magnetic properties. Not only the particle size, but also the shape of the particles, has a profound effect upon such properties. Thus the various properties of a powder are not only based upon the properties of the bulk material, but also upon the size and shape of the constituent particles.
Published Version
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