Ultra-violet light Ultra-violet (UV) light refers to electromagnetic radiation with shorter wavelengths than visible light, ranging from 10 to 400 nanometers. Although invisible to the human eye, UV light plays a crucial role in various applications. It is commonly known for its germicidal properties, used in disinfection processes, and is also utilized in technologies like UV curing in printing and adhesive industries. Additionally, the Earth's atmosphere partially absorbs UV rays, preventing most of them from reaching the surface. Exposure to excessive UV radiation from the sun can have harmful effects on living organisms, making UV protection important for human health. |