Diffusion: Incredibly fantastic particles measuring down below 0.1 micron get bounced about randomly and they are slowed by their interactions with atmospheric atoms and molecules. They sooner or later drift or get bounced into a filter fiber, whereupon (over again) they adhere inside a approach known as diffusion. กลิ่นไม่พึงประสงค์ เช่น https://www.mannature.com