Diffusion: Pretty fantastic particles measuring down below 0.1 micron get bounced all around randomly and therefore are slowed by their interactions with atmospheric atoms and molecules. They inevitably drift or get bounced right into a filter fiber, whereupon (yet again) they stick in a procedure identified as diffusion. ขนาดเล็กกะทัดรัดสามารถวางไว้ได้หลายที่ หลายมุม https://www.mannature.com