Diffusion: Very good particles measuring under 0.one micron get bounced about randomly and therefore are slowed by their interactions with atmospheric atoms and molecules. They finally drift or get bounced right into a filter fiber, whereupon (yet again) they stick inside of a approach known as diffusion. จัดส่งฟรี! เมื่อสั่งซื้อเครื่องกรองอากาศทุกรุ่น CADR https://www.mannature.com