How does agitation help particles move through a set of sieves?

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In the context of filtration, agitation is essential for the effective use of a stacked set of sieves. When a mixture of particles is placed on the top screen, the assembly is agitated to facilitate the movement of particles through the successive layers of screens.1

This mechanical motion helps overcome resistance and ensures that particles are properly sorted by their diameters, eventually distributing them among the sieves according to their size. By keeping the particles in motion, agitation allows those smaller than the screen openings to find and pass through the holes, ensuring a more accurate separation process.1