As described previously, cervical cancers are caused by infection with one of the high-risk HPV types. However, since not all people who are infected with HPV will develop cancer, it is likely that other factors also play a role in the development of cervical cancer.
ballast factor (BF) - The ratio of the light output of a fluorescent lamp or lamps operated on a ballast to the light output of the lamp(s) operated on a standard (reference) ballast. Ballast factor depends on both the ballast and the lamp type; a single ballast can have several ballast factors depending on lamp type. compact fluorescent lamp (CFL) - A family of single-ended fluorescent-discharge light sources with small-diameter [16-millimeter (5/8-inch) or less] tubes.
The C-Factor is a measure of the smoothness of a pipe's interior. All pipes have a roughness that resists water flow and causes a drop in pressure under flowing conditions. The roughness is indicated by a factor we call the C-Factor. The higher the C-Factor, the smoother the inside of the pipe. New plastic pipe would have a very high C-Factor. Old steel pipe would have a much lower C-Factor because of the corrosion that may have occurred within the pipe.