Mechanical Operations
For a non-spherical particle, the sphericity

Is always less than 1
Is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle
Has the dimension of length
Is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle

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Mechanical Operations
Rittinger's crushing law states that

Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product
Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product
Work required in crushing is proportional to the new surface created
For a given machine and feed, crushing efficiency is dependent on the size of the feed & product

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