What are photochemicals?

Photochemicals are chemical compounds that undergo a transformation when exposed to light, particularly ultraviolet (UV) or visible radiation. These reactions often involve the absorption of light energy, leading to changes in the molecular structure, which can result in the formation of new substances. Photochemicals play crucial roles in various processes, such as photosynthesis in plants and the formation of ozone in the atmosphere. They are also significant in applications like phototherapy and the development of solar energy technologies.