Chiphunzitso Kawirikawiri, tinthu kukula kusanthula amapereka kuchuluka kwa mbewu za diameters osiyana; kusanthula uku kungathe kuchitika mwa kusefa kapena kugwetsa m'madzi pogwiritsa ntchito lamulo la Stokes.
Kutengera kukula ndi kuchuluka kwa mbewu zomwe zimapanga gulu, zophatikizazo zimatchedwa fines, mchenga, miyala kapena miyala. Komabe, pagulu loperekedwa, njere zonse zomwe zimapanga sizikhala ndi miyeso yofanana.
Kuti muchite izi, mbewuzo zimagawidwa pamagulu angapo a sieve.
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