Diffusion: Very high-quality particles measuring under 0.1 micron get bounced around randomly and are slowed by their interactions with atmospheric atoms and molecules. They inevitably drift or get bounced right into a filter fiber, whereupon (all over again) they stick inside a method identified as diffusion. กิจกรรมเพื่อสาธารณะประโยชน์ของบริษัท Two Coway filters https://www.mannature.com