# Ultraviolet | ![img \|150](https://upload.wikimedia.org/wikipedia/commons/thumb/6/67/Pipefitter_welder_kutzo.jpg/320px-Pipefitter_welder_kutzo.jpg) | **Ultraviolet** (UV) is a form of electromagnetic radiation with wavelength shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs; Cherenkov radiation; and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights. | |-|-| | | wikipedia:: [Ultraviolet](https://en.wikipedia.org/wiki/Ultraviolet) |