Diffusion: Extremely good particles measuring down below 0.1 micron get bounced about randomly and are slowed by their interactions with atmospheric atoms and molecules. They sooner or later drift or get bounced into a filter fiber, whereupon (all over again) they stick in a procedure identified as diffusion. มีขนาดกะทัดรัด พกพาไปใช้งานได้อย่างสะดวกในทุกที่ https://www.mannature.com