Diffusion: Very good particles measuring below 0.one micron get bounced all over randomly and so are slowed by their interactions with atmospheric atoms and molecules. They at some point drift or get bounced into a filter fiber, whereupon (all over again) they stick in a very system called diffusion. เนื่องจากขนาดของเครื่องฟอกอากาศในรถยนต์ https://www.mannature.com/products/detail/airpurifier