Diffusion: Very Great particles measuring down below 0.one micron get bounced all-around randomly and so are slowed by their interactions with atmospheric atoms and molecules. They inevitably drift or get bounced right into a filter fiber, whereupon (over again) they stick inside of a process called diffusion. กลิ่นไม่พึงประสงค์ เช่น ควันบุหรี่ https://www.mannature.com