Size reduction is the operation carried out for reducing the size of bigger particles into smaller one of desired size and shape with the help of external forces.

COMMINUTION is another term used for size reduction.

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Mechanism of size reduction

 Impact —particle concussion by a single rigid force (hammer).
 Compression—particle disintegration by two rigid forces (nutcracker).
 Shear —produced when the particle is compressed between the edges of two hard surfaces moving tangentially.
 Attrition —arising from particles scraping against one another or against a rigid surface (a file).

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