The continuous zig-zag motion of particles (aerosols) in suspension The motion is caused by the impact of the molecules of the fluid (air) upon the particles ABCDEFGHIJKLMNOPQRSTUVWXYZ Ottawa - Tel: (613) 836-2748 / Fax: (613) 836-1063 Across Canada - Tel: 1-800-265-4303 / Fax: 1-800-611-2511