Diffusion: Extremely Wonderful particles measuring beneath 0.one micron get bounced close to randomly and they are slowed by their interactions with atmospheric atoms and molecules. They sooner or later drift or get bounced right into a filter fiber, whereupon (yet again) they adhere in a approach named diffusion. กลิ่นไม่พึงประสงค์ เช่น waiting for link from Social Network Posts (41)