puistematerjali (pulbri) jaotamine mõõtmete järgi osisteks vastuvoolu voolava gaasijoas (õhk) või vedelikujoas (vesi) (vt klassifikatsioon), a test for particle size in which the speed of a liquid or gas is used to suspend particles of a desired size, with larger sizes settling for removal and weighing, while smaller sizes are removed, collected, and weighted at certain time intervals (see: classification)