Diffusion: Pretty wonderful particles measuring beneath 0.1 micron get bounced all over randomly and they are slowed by their interactions with atmospheric atoms and molecules. They at some point drift or get bounced into a filter fiber, whereupon (over again) they stick in a process termed diffusion. ฝุ่นละออง, เชื้อรา, ละอองเกสร https://www.mannature.com/products/detail/airpurifier