Diffusion: Extremely High-quality particles measuring under 0.one micron get bounced all over randomly and so are slowed by their interactions with atmospheric atoms and molecules. They eventually drift or get bounced right into a filter fiber, whereupon (all over again) they adhere in a method identified as diffusion. กลิ่นไม่พึงประสงค์ เช่น Successfully Submitted (Awaiting Approval)