Ghosting on Walls and Ceiling
This shows the deposit in corners of the room where turbulance deposits small particles.
"Ghosting" refers to the darkening of areas on the walls or ceiling due to the deposition of particles at
specific locations. These locations are typically areas of local air turbulence or areas where the distance
between two surfaces is small so that the net force of diffusion on small particles is toward the surfaces.
In this case the darkening is due to the formation of small areas of turbulence in the corners of a room.
The effect shown here required 25 years to form. Ghosting will appear much more quickly if the turbulence
is greater and if there is more soot in the environment.
Significance in the Environment: