Ultraviolet
- Ultraviolet (UV) radiation
is electromagnetic radiation of a wavelength shorter than that of
visible light, but longer than that of soft X-rays. The name means "beyond
violet" (from Latin ultra, "beyond"), violet being
the color of the shortest wavelength of visible light. It is colloquially
called black light, as it is invisible to the human eye. UV itself
can be subdivided into near UV (380-200 nm wavelength) and extreme
or vacuum UV (200-10 nm). When considering the effects of UV radiation
on human health, the range of UV wavelengths is often subdivided
into UV-A (380-315 nm), UV-B (315-280 nm), and UV-C (280-10 nm).
Ordinary glass is transparent to UV-A but is opaque to shorter wavelengths.
Quartz glass, depending on quality, can be transparent even to vacuum
UV wavelengths. The sun emits ultraviolet light in both the UV-A
and UV-B bands, but because of absorption in the atmosphere's ozone
layer, 99% of the ultraviolet light that reaches the Earth's surface
is UV-A.
(Source: Wikipedia, the Free Encyclopedia)
- relating to invisible light:
relating to or producing electromagnetic radiation of wavelengths
from about 5 to about 400 nanometers, beyond the violet end of the
visible light spectrum
(Source: Encarta® World English Dictionary)
- (1) situated beyond the
visible spectrum at its violet end -- used of radiation having a
wavelength shorter than wavelengths of visible light and longer than
those of X rays. (2) relating to, producing, or employing ultraviolet
radiation.
(Source: Merriam-Webster Online Dictionary)
We provide this glossary
to assist clients in the selection and operation of our complete
line of Ultra-Pure Laboratory
Ozone Generators, Ozone
Gas Analyzers, and Ozone
Accessories, as well as services such as material
exposure testing.
|