Processes involving any kind of size enlargement receive diverse denominations including compaction, granulation, encapsulation, pelletizing, agglomeration, and sintering. A generic classification could divide size enlargement operations into two main categories: those operations in which the enlargement objective is to control functional properties such as rehydration, and those in which the enlargement objective is to produce defined forms such as tablets or pellets. In terms of strength, such property is relevant for the final product, but also plays a role during the size enlargement operation. Pertaining porosity, different strength levels develop primarily because agglomerates growing by coalescence feature higher porosity than those from pressure agglomeration. Normally, an increase in external forces acting on the particulate matter during size enlargement will cause porosity and related characteristics to decrease, and density and strength to increase. Specific shapes of different sorts are extensively obtained by extrusion in industries as diverse the grain processing industry and the polymers industry.