Mechanical Operations
Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their

Densities
Terminal velocities
Particle sizes
None of these

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Mechanical Operations
For a non-spherical particle, the sphericity

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

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