Login | Signup now       

Guest

 Click to see how  

HOME | VIDEOS | DOCUMENTS | COLLECTIONS | UPLOAD | BROADCAST | MY ACCOUNT | FEEDBACK | ABOUT

Share  Title: NASA: Exploring Ozone

 
iConnect (Beta)   |  Like   |    Sponsor  |   Comment   |    Report  

Related Profiles

If you are an author or an inventor or an individual related to the work displayed in this video, you can click on the 'add me as' button to link your researchusa profile to this entry. Doing so automatically puts you on the iConnect network bringing great visibility to all your related work.

    
 
Article

View Cross Ref (Beta)

Your Edit is Valuable. Editor's names show on Edit pannel.Edit this article  

 
[var.doi;ope=max:15000;onformat=makelink;htmlconv=no]

For more information:

http://www.nasa.gov/vision/earth/environment/ozone_resource_page.html

Ozone (O3) is a triatomic molecule, consisting of three oxygen atoms. It is an allotrope of oxygen that is much less stable than the diatomic O2. Ground-level ozone is an air pollutant with harmful effects on the respiratory systems of animals. Ozone in the upper atmosphere filters potentially damaging ultraviolet light from reaching the Earth's surface. It is present in low concentrations throughout the Earth's atmosphere. It has many industrial and consumer applications. Ozone therapy is a controversial alternative medicine practice; mainstream scientific medicine has found ozone to be harmful to humans,[1] and equipment intended to be used for ozone therapy is banned in the United States.[2]

Ozone, the first allotrope of a chemical element to be described by science, was discovered by Christian Friedrich Schönbein in 1840, who named it after the Greek word for smell (ozein), from the peculiar odor in lightning storms.[3] The odor from a lightning strike is from ions produced during the rapid chemical changes, not from the ozone itself.[4]

The highest levels of ozone in the atmosphere are in the stratosphere, in a region also known as the ozone layer between about 10 km and 50 km above the surface (or between 6.21 and 31.1 miles). Here it filters out the shorter wavelengths (less than 320 nm) of ultraviolet light, also called UV rays, (270 to 400 nm) from the Sun that would be harmful to most forms of life in large doses. These same wavelengths are also among those responsible for the production of vitamin D, which is essential for human health. Ozone in the stratosphere is mostly produced from ultraviolet rays reacting with oxygen:

O2 + (radiation < 240 nm) → 2 O
O + O2 → O3

It is destroyed by the reaction with atomic oxygen:

O3 + O → 2 O2

(See Ozone-oxygen cycle for more detail.)

The latter reaction is catalysed by the presence of certain free radicals, of which the most important are hydroxyl (OH), nitric oxide (NO) and atomic chlorine (Cl) and bromine (Br). In recent decades the amount of ozone in the stratosphere has been declining mostly due to emissions of CFCs and similar chlorinated and brominated organic molecules, which have increased the concentration of ozone-depleting catalysts above the natural background. Ozone only makes up 0.00006% of the atmosphere. See ozone depletion for more information.

 
[var.addon_information]

 
Related Documents
Primitivism in Paul Gauguin's Where Do We Come From? What Are We? Where Are We Going? (1898)
Hummingbird Flight
The Combustion of Aluminum in Solid Rocket Propellants
Plasma Wind Tunnels
Physics of flow about lifting bodies
Hints for understanding low speed wind tunnels
Metro Station Complex- A Public Realm
Fiber-Optic based Dynamic Pressure sensor for Combustion
Modeling and Simulation of Mixing Layer Flows For Rocket Engine Film Cooling
A Technical Essay on the Gyroplane
Science, Technology, Engineering, and Mathematics Undergraduate Education: Balancing Technical Skill with Democratic Principles
Laminar Separation Bubble
Decline of the Tip-Jet
Temperature measurements during Reentry
Modeling and Analysis of Globalizing Manufacturing SMEs in Developing Economies
 
Member Documents
[var.mwpaper;htmlconv=no;]
 

Keywords
NASA  Goddard  Space  Flight  Center  TV  antarctic  ozone  
hole  Paul  Newman  climate  change  earth  science  CFC  
air  pollution  
 
 About This Video
 
 Subject Earth and Atmospheric Sciences
 Category Documentary
 Duration 00:02:20
 Views 2221
 Added 09-12-07
 Contributor    appliedmath
 Add to Favourites
 Report Abuse
 
 Related Videos
 See More

Boeing

 RunTime  00:00:35
 Uploaded  28-12-07
 Views  2454
   
 Boeing 747 Wing Tip Vorte...

CO2

 RunTime  00:01:55
 Uploaded  10-01-08
 Views  2315
   
 CO2 emissions and climate...

Kennedy

 RunTime  00:02:39
 Uploaded  15-01-10
 Views  2407
   
 Kennedy Space Center STS ...

Moon

 RunTime  00:02:00
 Uploaded  09-12-07
 Views  2334
   
 Moon Return Video

The

 RunTime  00:00:02
 Uploaded  06-11-07
 Views  2363
   
 The Hubble Deep Field: Th...

CEV

 RunTime  00:00:02
 Uploaded  22-10-07
 Views  2470
   
 CEV NASA space launch roc...

STS-118

 RunTime  00:09:33
 Uploaded  08-01-08
 Views  2138
   
 STS-118 Space Shuttle End...

Saturn:

 RunTime  00:09:54
 Uploaded  12-01-10
 Views  2476
   
 Saturn: A Giant Thrust in...

Arianespace

 RunTime  00:04:42
 Uploaded  08-01-08
 Views  2226
   
 Arianespace ESA (Europea...

The

 RunTime  00:06:50
 Uploaded  27-12-07
 Views  2250
   
 The Phoenix Mars Lander

The

 RunTime  00:07:38
 Uploaded  13-01-10
 Views  2449
   
 The Lunar Orbiter: A Spac...

NASA's

 RunTime  moderate
 Uploaded  29-09-12
 Views  325
   
 NASA's Curiosity Finds Fi...

United

 RunTime  00:18:51
 Uploaded  12-01-10
 Views  2370
   
 United States Space Explo...

Phoenix

 RunTime  00:10:00
 Uploaded  09-12-07
 Views  2254
   
 Phoenix Launch

Acoustic

 RunTime  00:01:49
 Uploaded  27-12-07
 Views  2302
   
 Acoustic Levitation Chamb...

Best

 RunTime  00:01:23
 Uploaded  15-01-10
 Views  2225
   
 Best of The Beautiful Uni...

adorable

 RunTime  moderate
 Uploaded  22-09-12
 Views  432
   
 adorable extremophiles

Paul

 RunTime  00:05:29
 Uploaded  20-12-07
 Views  2187
   
 Paul DuSold Teaches Oil P...

 Member Videos
 See More

GPU

 RunTime  00:00:21
 Uploaded  10-12-07
 Views  3047
   
 GPU fluid simulation - fi...

GPU

 RunTime  00:00:29
 Uploaded  10-12-07
 Views  2607
   
 GPU fluid simulation - bl...

Chaos

 RunTime  00:10:21
 Uploaded  28-11-07
 Views  2457
   
 Chaos and Fractals in Sim...

GPU

 RunTime  00:00:37
 Uploaded  10-12-07
 Views  2453
   
 GPU fluid simulation - ad...

Greedy

 RunTime  00:00:39
 Uploaded  10-12-07
 Views  2435
   
 Greedy Computation of a H...

Lugosi

 RunTime  00:09:02
 Uploaded  28-11-07
 Views  2419
   
 Lugosi teaches math - Man...

Chaos

 RunTime  00:09:24
 Uploaded  28-11-07
 Views  2406
   
 Chaos and Fractals in Sim...

Lugosi

 RunTime  00:10:30
 Uploaded  28-11-07
 Views  2399
   
 Lugosi teaches math - Abs...

Chaos

 RunTime  00:10:36
 Uploaded  28-11-07
 Views  2367
   
 Chaos and Fractals in Sim...

UCSD

 RunTime  00:03:25
 Uploaded  10-12-07
 Views  2350
   
 UCSD Computational MS Dem...

Moon

 RunTime  00:02:00
 Uploaded  09-12-07
 Views  2334
   
 Moon Return Video

Lugosi

 RunTime  00:10:20
 Uploaded  28-11-07
 Views  2281
   
 Lugosi teaches math - Man...

 

 

Comments | Queries | Clarifications