What is ultraviolet rays?

Everyone has the opportunity to expose UV radiation of the sun. The sun emits electromagnetic radiation of different wavelengths. Some radiation is visible to human eyes, such as the color of the rainbow. However, ultraviolet rays are an invisible radiation outside the purple end of the visible light.

UV (UV) is also known as electromagnetic radiation. According to the wavelength, it can be divided into 3 bands, namely UVA, UVB and UVC.

UVC has the shortest wavelength (100-280nm), and almost all UVC radiation can reach the surface of the earth, because all UVCs are absorbed by the atmosphere

UVB radiation is slightly longer than UVC (280-315nm), and about 90 % of UVB is absorbed by the atmosphere. Therefore, the UVB content in the surface of the earth's surface is less than 2 %.

UVA has the longest wavelength (315-400nm), and more than 98 % of the radiation on the surface of the earth is UVA because it is less affected by the atmosphere.

Click hereGet more information on the website of the Hong Kong Observatory.

UV rays are used in many different fields such as medical, business and daily life.

UVA and UVB are usually used in medical applications, such as the treatment and environmental sterilization of different diseases. Moreover, UVA is effective for controlling pests and checking forgery banknotes.

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Generally, UVC can be used for water disinfection and disinfection on the surface of items. For example, some companies in the world are installing UVC lights in the refrigerator for supermarkets to store foods in aseptic environments, so as to save a lot of money by reducing food waste. In addition, UVC is suitable for our daily life for disinfection of the surface of mobile phones, keys, and glasses.