Ozone (O3), also known as superoxide, is an allotrope of oxygen (O2), which is a light blue gas with a special odor at normal temperature. Ozone is mainly distributed in the stratospheric atmosphere at a height of 10 to 50 km, and the maximum value is between 20 and 30 km.
In 1840, Christian Friedrich Schönbeindiscovered that a special odor gas was released when electrolyzing dilute sulfuric acid, so it was named ozone. Under normal temperature and pressure, the stability is poor, and it can be decomposed into oxygen by itself. Ozone has the taste of grass, and inhalation is beneficial to the human body. Excessive inhalation has certain harm to human health. Non-flammable, pure. Oxygen can be changed to ozone by electric shock.