Ozone - Discovery of ozone

Ozone (O3) is an allotrope of oxygen, the molecule consisting of three oxygen atoms instead of the more stable diatomic O2. Ozone is a pale blue gas at standard temperature and pressure. It forms a dark blue liquid below -112 °C and a dark blue solid below -193 °C. Ozone is a powerful oxidizing agent. It is also unstable, decaying to ordinary oxygen through the reaction: 2O3Including:

• Ozone - Ozone layer
• Ozone - Discovery of ozone
• Ozone - Industrial production
• Ozone - Use in industry
• Ozone - Use in medicine
• Ozone - Air pollution
• Ozone - Other uses

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See main articles: Tropospheric ozone and Air pollution. Ozone is not directly emitted by car engines or by industrial operations themselves. These sources emit hydrocarbons and nitrogen oxides that react with sunlight to form ozone directly at the source of the pollution being emitted and in the atmosphere's boundary layer (1 to 3 km altitude). The mix of hydrocarbons, nitrogen oxides, and ozone are the major components of smog that frequently occurs in urban and suburban areas. Recent satellite maps of nitrogen dioxide (NOSee also:

Ozone, Ozone - Ozone layer, Ozone - Discovery of ozone, Ozone - Industrial production, Ozone - Use in industry, Ozone - Use in medicine, Ozone - Air pollution, Ozone - Other uses

Read more here: » Ozone: Encyclopedia II - Ozone - Air pollution

Ozone, along with hypochlorite ions, is naturally produced by white blood cells and the roots of marigolds as a means of destroying foreign bodies. When ozone breaks down it gives rise to oxygen free radicals, which are highly reactive and damage or destroy most organic molecules. Ozone has a number of medical uses. It can be used to affect the body's antioxidant-prooxidant balance, since the body usually reacts to its presence by producing antioxidant enzymes. Many hospitals in the U.S. and around the world use large ozone generators ...

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Ozone, Ozone - Ozone layer, Ozone - Discovery of ozone, Ozone - Industrial production, Ozone - Use in industry, Ozone - Use in medicine, Ozone - Air pollution, Ozone - Other uses

Read more here: » Ozone: Encyclopedia II - Ozone - Use in medicine

Industrially, ozone is produced with short wavelength ultraviolet radiation from a mercury vapor lamp or the application of a high voltage electrical field in a process called cold discharge. The cold discharge apparatus consists of two metal plates separated by an air gap and a high dielectric strength electrical insulator such as borosilicate glass or mica. A high voltage alternating current is applied to the plates and the ozone is formed in the air gap when O2 molecules disassociate and recombine into O3. A f ...

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Ozone, Ozone - Ozone layer, Ozone - Discovery of ozone, Ozone - Industrial production, Ozone - Use in industry, Ozone - Use in medicine, Ozone - Air pollution, Ozone - Other uses

Read more here: » Ozone: Encyclopedia II - Ozone - Industrial production

See main article: Ozone layer. The highest levels of ozone in the atmosphere are in the stratosphere, in a region also known as the ozone layer. Here it filters out the shorter wavelengths (less than 320 nm) of ultraviolet light (270 to 400 nm) from the Sun that would be harmful to most forms of life in large doses. These same wavelengths are also responsible for the production of vitamin D, which is essential for human health. The standard way to express total ozone amounts in the atmosphere is by using Dobson units. Ozone used in industry is measured in ppm (OSHA exposure limits for exa ...

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Ozone, Ozone - Ozone layer, Ozone - Discovery of ozone, Ozone - Industrial production, Ozone - Use in industry, Ozone - Use in medicine, Ozone - Air pollution, Ozone - Other uses

Read more here: » Ozone: Encyclopedia II - Ozone - Ozone layer

Ozone can be used for bleaching substances and for killing bacteria. Many municipal drinking water systems kill bacteria with ozone instead of the more common chlorine. Ozone does not form organochlorine compounds, but it also does not remain in the water after treatment, so some systems introduce a small amount of chlorine to prevent bacterial growth in the pipes, or may use chlorine intermittently, based on results of periodic testing. Where electrical power is abundant, ozone is a cost-effective method of treating water, as it is produced ...

See also:

Ozone, Ozone - Ozone layer, Ozone - Discovery of ozone, Ozone - Industrial production, Ozone - Use in industry, Ozone - Use in medicine, Ozone - Air pollution, Ozone - Other uses

Read more here: » Ozone: Encyclopedia II - Ozone - Use in industry