Ultraviolet Information Air Sterilisation with ultraviolet is applied physics Ultraviolet radiation is electromagnetic waves which can be employed under control, like visible light. Its spectral range extends from 185 to 245 nanometer. 1nm corresponds to 1 billionth of a metre. The wavelength range around 250 nm is suitable for air and water sterilisation. Why does ultraviolet sterilise? All micro-organisms incorporate amongst other things nucleic acid. Since nucleic acids absorb the impinging radiation energy, a photo-chemical process is triggered off which damages the reproductive apparatus (DNA) of the micro-organisms and kills the bacteria. The maximum radiation absorption of the nucleic acid is virtually in the maximum emission range of the UV low pressure burner. Ultraviolet Radiation Ultraviolet lamps produce a photo-chemical by radiation or oxidisation by ozone process which damages the reproductive DNA of the micro-organisms. In other words Ultraviolet radiation and ozone sterilise the air and surfaces. UV and ozone has the ability to sterilise air, surfaces and liquids without the danger of immunity build up as happens with most chemicals. An Ultraviolet wave-length of 245 nanometer and ozone wave-length of 185 nanometer are the wave-lengths that are used for sanitation. These wave-lengths do not have any harmful health-risks or side-effects, and do not leave a residue after treatment.