Ultraviolet definition

Ultraviolet definition
The ultraviolet ray is very big to the injury to the skin of ultraviolet ray, in such a season, what antiultraviolet are we? Want to defend the purple exterior ultraviolet ray, we must know what is an ultraviolet ray.
Ultraviolet ray is English famous Ultraviolet ray and (Ultraviolet radiation, abbreviate as UV is to find specially by the intersection of Germany and scientific family, the ultraviolet ray is the wavelength in the electromagnetic spectrum from 100- 400nm (nanometer) General name of radiation.
The shorter the ultraviolet wavelength is, endanger the more greatly to the human skin. The shortwave ultraviolet ray can cross the dermis, the mediumwave can enter dermis.
The ultraviolet ray is the invisible light wave of a kind of naked eye, wavelength range is 100-40nm (nanometer) Exist outside ultraviolet end of spectrum, so call it the ultraviolet ray, according to different wavelength ranges, cut and divided into A, B, C three kinds of wave bands, the ultraviolet wavelength of C wave band among them is among 240-260nm, it is the most effective sterilization wave band, the most vigorous point of wavelength in the wave band is 253.7nm. Ultraviolet ray in the nature send out by the sun mainly, according to wavelength being different to divide into UVA, UVB, UVC; UVA is a life ultraviolet ray, the range 315-400nm of the wavelength, can kick into people's skin through glass of window and cloud; UVB outdoor ultraviolet ray, the intersection of wavelength and the intersection of range and 280-315nm, in kick into the skin directly while moving while being outdoor people. Has not absorbed UVA and UVB lost by the ozone layer and will be shone to surface of the earth, brings the injury to our skin. UVC is that a ultraviolet C wave band wavelength range is among 200-280nm, the ultraviolet ray section C that the sun emits is nearly all filtered by the ozone layer of the atmosphere on the senior level in the nature. UVC can penetrate microorganism and mankind's cell and cause damaging to DNA in the thin tire, it is exactly characteristic of this of utilizing VUC, deactivates and sterilizes the microorganism in water. UVC most effective sterilization wave band, the most vigorous point of wavelength in the wave band is 253.7nm.
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