What is Ozone: Definition and 55 Discussions

Ozone (), or trioxygen, is an inorganic molecule with the chemical formula O3. It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O2, breaking down in the lower atmosphere to O2 (dioxygen). Ozone is formed from dioxygen by the action of ultraviolet (UV) light and electrical discharges within the Earth's atmosphere. It is present in very low concentrations throughout the latter, with its highest concentration high in the ozone layer of the stratosphere, which absorbs most of the Sun's ultraviolet (UV) radiation.
Ozone's odour is reminiscent of chlorine, and detectable by many people at concentrations of as little as 0.1 ppm in air. Ozone's O3 structure was determined in 1865. The molecule was later proven to have a bent structure and to be weakly paramagnetic. In standard conditions, ozone is a pale blue gas that condenses at cryogenic temperatures to a dark blue liquid and finally a violet-black solid. Ozone's instability with regard to more common dioxygen is such that both concentrated gas and liquid ozone may decompose explosively at elevated temperatures or fast warming to the boiling point.
It is therefore used commercially only in low concentrations.
Ozone is a powerful oxidant (far more so than dioxygen) and has many industrial and consumer applications related to oxidation. This same high oxidizing potential, however, causes ozone to damage mucous and respiratory tissues in animals, and also tissues in plants, and above concentrations of about 0.1 ppm. While this makes ozone a potent respiratory hazard and pollutant near ground level, a higher concentration in the ozone layer (from two to eight ppm) is beneficial, preventing damaging UV light from reaching the Earth's surface.

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  1. A

    What is this type of bulb or lamp?

    Hi there! I have few years still without any solution. I could find just only one exemplary of this bulb or lamp there I share pictures, this is exactly what I need to know what it is, brand or datasheet. The base is E27. AND the most important, In this VIDEO you can see the lamp...
  2. J

    What are the current regulations for adding a signature on online forums?

    Hello, everybody, I am Jesse, a ozone technology and techinical engineer from China. Currently we focus on corona discharge to make ozone from 3g/hr to 50kgs/hr. Jesse
  3. voltech444

    Automotive Ozone Enhanced Combustion of Water/Diesel Emulsion in CI Engines

    I have a single cylinder 5kW diesel generator to use for fuel efficiency and emissions reductions improvement experiments. I built an emulsifier out of an old drill press and paint cans. It's basically just a spinning cylinder inside another cylinder to get a lot of shearing force. The...
  4. Ygggdrasil

    RIP Mario Molina, Nobel Laureate for work on ozone layer

    https://www.reuters.com/article/us-mexico-molina/mexican-nobel-laureate-molina-ozone-layer-prophet-dies-at-77-idUSKBN26T03Q Molina shared the 1995 Nobel Prize in Chemistry with Paul Crutzen and F Sherwood Rowland "for their work in atmospheric chemistry, particularly concerning the formation...
  5. N

    What would happen if ozone, nitrogen and oxygen disappear?

    Hi everyone! I have some trouble figuring out the following question: If oxygen, nitrogen and ozone did not absorb UV radiation, what would you expect the temperature profile in the atmosphere to look like between the surface and top of the atmosphere? Specify the temperatures at Tropopause...
  6. I

    Is the O3 Molecule Polar Due to Fractional Charges and Nonlinear Geometry?

    Is O3 molecule polar or non-polar? I am confused. If it is molar, could you explain why? Thinking you.
  7. K

    Question about stability of Ozone

    The enthalpy of formation of O3 is positive. Change in entropy for the formation of O3 is also negative( as the number of gaseous moles is decreasing). This means that Delta G is positive for all temperatures. So formation of ozone should be non spontaneous at all temperatures. Then how does it...
  8. G

    Calculating Ozone Levels from Air Purifier Output: Converting mg/hr to ppb

    Editor Note: Moved from a technical forum and therefore no template. Hi! I'm terrible at this sort of thing so came to this forum for help. I'm trying to figure out how much ozone an air purifier will throw into my indoor air. The unit produces 360 mg/hr. My space is 2500 square feet...
  9. B

    Amateur author seeking help on attacking ozone layer

    Hi, I'm looking for plausible fiction based content regarding environmental destruction. Sort of future UV wars or something. So here goes. Would appreciate any ideas or feedback on what I've come up with so far. Several dissidents build 12ft mirrored parabolic dishes which shine narrow focussed...
  10. R

    Ozone Depletion: A Cause for Concern Despite Limited UV Radiation

    If only 14% of the total solar emission is in the UV region, why is ozone depletion a cause for concern. Considering that only a small fraction of the sun's total radiation reaches earth.
  11. S

    Wimshurst Machine Build, Ozone Production

    I've seen the electrostatic generators as a student but never had a chance to operated one. So I built one. A small one using compact disks. Now I am in the process of building a larger one, using two 12 inch disks cut from acrylic. I've got the completed disks (32 sectors each), base...
  12. Y

    Ozone Solubility in Water and Its Potential Health Impact

    Hi everyone Let say i have a 60 liters water tank filled with tap water (no fluoride). And i keep this 60 liters of water saturated with ozone at 600 ORP for 24 hours. The saturation method is just simple airstone zone diffusing method. so, will this ozone gas leaks(or diffuse out) out to the...
  13. H

    Using graphite as a catalyst to break down Ozone

    Can graphite be used as a catalyst to break down ozone into oxygen without serious oxidization? The applied use for this is to break down ozone at the output of an ionic wind "fan". Similar operation to an ion thruster used by NASA but instead of using stored gasses and propelling them into...
  14. C

    Oxygen atmosphere without ozone layer

    OK, so I would like the following idea: -planet which already had its Great Oxygenation Event and life forms including human beings would be able to breath there freely -no oxygen layer or any other plausible mechanism which would practically preclude any daily life forms on the surface (all...
  15. K

    Chemical production of ozone in the laboratory

    The followings are the chemical reactions I learned at my university: K2S2O8(s) + H2SO4(concentrated) → H2S2O8 + K2SO4 H2S2O8 + 2H2O → H2O2 + 2H2SO4 H2O2 (heat)→ H2O + [O] [O] + O2 → O3 However, I'm wondering why I can't find these reactions anywhere on the Internet. What do you think...
  16. M

    I made the following orbital diagram for ozone is it correct?

    Hi, Could someone tell me if the following orbital diagram is correct for ozone? I added the bonds and lone pairs in color. Thanks in advance.
  17. I

    Is it safe to use an ozone generator while inside with pets?

    Hello. I hope this is the right place. A few days ago I purchased a nice sectional off craigslist that belonged to a smoker (I bought it because it's very nice and expensive but was cheap for that reason). I hired a professional cleaner who gave it an initial treatment that helped but...
  18. R

    Calculating Heat Energy Released in Ozone Decomposition Reaction

    I have been doing some research on ozone recently, and I have a question that none of my resources have answered... The following reaction is an exothermic reaction, but how would I calculate the amount of heat energy is released? O_{3} \underbrace{\rightarrow}_{uv\ light} O_{2} + O...
  19. C

    Can liquid ozone substitute for liquid oxygen?

    I was just wondering that if ozone is a strong[er] oxidizing agent [that oxygen alone] and its boiling point is higher than liquid oxygen [more practical?], then can it be used for applications where liquid oxygen is usually used?
  20. Gannet

    And the headline is: Why Does Arctic Ozone Hole Appear Later Than Antarctic?

    See http://news.nationalgeographic.com/news/2011/03/110321-ozone-layer-hole-arctic-north-pole-science-environment-uv-sunscreen/ As I understand it and please correct me if I am wrong in any of the statements below That the ozone hole is due to CFC in the stratosphere That more CFC are...
  21. Simfish

    Do nearby gamma ray busts/supernova damage *more* than just the ozone layer?

    http://en.wikipedia.org/wiki/Near-Earth_supernova So we know that many people are putting hard constraints on the galactic habitability zone based on the presence of nearby supernova/gamma ray bursts. But if they *only* affect the ozone layer, then I doubt that it's as hard of a constraint as...
  22. A

    The composition of ozone is O3 and the oxygen O2 present in

    the composition of ozone is O3 and the oxygen O2 present in atmosphere.considering the masses of O3 and O2 , the O3 is more heavier than O2 then also ozone is situated above the oxygen (O2) present in atmosphere. why is it so? advanced thanks.
  23. Mentallic

    Ozone Depletion: Debates & Evidence

    Ozone depletion "fake" I'm searching for a site that will give a detailed summary of what the conservatives (I'm sure they existed, they always do) used as their arguments or evidence to show that CFC emissions were not destroying our ozone layer. I want to see some debating back then before...
  24. Jon Richfield

    Who cares about Earth's magnetic field and ozone layer?

    It seems to me that concern occasioned by the risks attendant on loss of the Earth's magnetic field is very nearly totally misplaced. Could someone please help me worry?:cool: I realize that popular science is largely hooey, but some items are so widely circulated that it is hard to find...
  25. R

    How Does Light Influence Ozone Dissociation?

    Homework Statement Ozone dissociate according to this reaction O3 ---> O2 + O /_\H = +106.4KJmol-1 (1) Calculate how much energy is required in Joules to dissociate a single molecule of ozone? (2) Determine the wavelenght of light that has this energy. What region of the electro...
  26. F

    Ozone heating the lower stratosphere.

    So, I'm a student working on a M.S. Environmental Science. I just took a test, the course is Mechanisms in the Environment, and got a question marked wrong that I believe is a correct answer. The question was, paraphrased, Can ozone formation in the mid to upper stratosphere heat up the...
  27. K

    Does the Ozone Layer Have to Fall Due to Its Molecular Mass?

    The molecular mass of ozone is 48. But the average molecular mass of air on ground is 29... So, doesn't the ozone layer have to fall?
  28. N

    Scenario of gamma ray bursts if it were to come into contact with the earth's ozone

    Is there a video of that kind of scenario floating around youtube? Have not had any luck finding a video of such a scenario.
  29. K

    Ozone Decomposition: Half-Life & Pressure Effects

    I have recently found that the half-life of ozone at a temperature of 250°C is 1.5 seconds. However, this source (http://www.lenntech.com/library/ozone/decomposition/ozone-decomposition.htm) failed to give any statistics on the effect of pressure on ozone decomposition. My question is; if the...
  30. S

    Why is Ozone so high in the atmosphere?

    Ozone (O3) has a higher molecular weight than regular O2 gas. According to Gay-Lussacs law, O2[SUB]and O3 should occupy the same volume, and therefore O[SUB]3 will have a higher density. Higher densities sink, so why does ozone stay so high in the atmosphere?
  31. Z

    Ozone effect on Icehouse (East Antarctica) - good or bad?

    Removing ozone from lower stratosphere (i.e. ozone hole) cools cold air further over Antarctica. Also ozone decrease, and carbon dioxide increase both contribute to increase in southern westerlies, which support ACC (Antarctica circumpolar current). Increase in westerlies pushes surface cold...
  32. Y

    Write the chemical equation for the formation of ozone.

    Homework Statement Ozone can be prepared from molecular oxygen by subjecting oxygen to an electrical discharge. The standard free energy of formation of ozone is +163.4kJ/mol. a) write the chemical equation for the formation of ozone. b) what sign of the entropy change for this...
  33. M

    What else should I know about ozone emission from ionization experiments?

    So I'm preparing to run an experiment involving Ionization. Unfortunately during my research, I've found out that when air is ionized (much like a lightning strike) it produces ozone. I learned that ozone molecules are unstable and usually dissipate back into O2 molecules in about 20 minutes...
  34. W

    Stars, Ozone, & Evolution of Complex Life

    Earth first formed about 4.6 billion years ago, condensing out of the gases & dust in the proto-Sun's Planetary Disk. But, for about the 1st billion years, the proto-planet was repeatedly pummeled by swarms of Impactors. They deposited gargantuan quantities of energy onto the Earth's surface...
  35. L

    How to Construct an Ozone Generator Using a Discharge Tube?

    Ozone Generation (Help required) I am working on the project of "Ozone generation". Generation of ozone is done using discharge tube working at around 6KV. But the source from where I got the details of the project doesn't provided the information on the construction part of it. Please...
  36. F

    Photoelectric Effect and ozone layer

    Hi. I hope someone can help. Here is the problem: [Pennies are made of zinc coated with copper. Copper has a work function of 4.7eV. The ozone layer blocks nearly all solar radiation with wavelength shorter than 320nm, but a very small amount of 200nm light still manages to reach the Earth's...
  37. M

    Can lightning induce ozone formation in the upper atmosphere?

    I wonder if lightning in the upper atmosphere can create ozone? Anybody know what the chemical reaction would be?
  38. L

    Ozone Pollution: What You Need to Know

    Ok, my area today had an air stagnation advisory, but I was a little confused with the following when reading the explanation in the advisory: Can someone give me an explanation on the 'pollutant of ozone'?
  39. Evo

    Record low temperatures in Arctic ozone layer - causing ozone loss

    It seems the colder artic winters have been causing ozone damage. Warmer weather stops the ozone damage. Go Figure. "The first signs of ozone loss have now been observed in the Arctic this winter, and large scale losses are expected to occur if the cold conditions persist. Overall...
  40. P

    Ozone Concentration: 25 Dobson Units

    Homework Statement If the ozone concentration in a particular sample of air were 25 dobson units, what sould this concentration be in: a)ppm b) %(v/v)Homework Equations 1 dob = 2.69*10^20 ozone molecules / m^2 http://en.wikipedia.org/wiki/OzoneThe Attempt at a Solution The question is asking...
  41. P

    The Role of UV Radiation in Ozone Formation and Depletion

    The majority of the ozone in the atomsphere occur because of UV breaking O2 into O and than O + O2 -> O3. But for the half of the hemisphere where no sun is shining, this chemical reaction wouldn't occur because no UV rays are apparent. Hence there are virutally no ozone in the atompshere at...
  42. F

    Ozone Formation: Understand the Process with FS

    Hi, I am working on a project that involves molecules of water vapor, hydrocarbon and O2 being broken down by a laser beam (193nm) and ozone being formed as a result of that; and was wondering if anybody could explain the phenemenon to me (even briefly), or point me out to the right...
  43. P

    Revolutionizing Ozone Restoration: Jet Engine Ozone Seeding Idea

    Would it be possible to tune commercial jet engines to emit ozone and replenish the ozone layer?
  44. R

    Do Cows Contribute More to Global Warming Than Industrial Pollutants?

    Dear Cecil: Is it true that cow, sheep, and termite flatulence does more damage to the ozone layer than fluorocarbons? How much damage do human farts do? --Mojo, Washington, D.C. Cecil replies: Couple issues we need to deal with here, Moe. The first is your imperfect grasp of the...
  45. B

    Converting mg/hr to ppm for Ozone Production

    Hey Anybody, Does anyone know how to change mg/hr into ppm? specifically for ozone. Not how much ozone would be in a room, but how much the machine would be producing. If the most the machine would produce is 1,200mg/hr, how much ozone, in ppm, would the machine produce? Thanks! :smile:
  46. Pengwuino

    Is Ozone the Key to Understanding the Chemistry of the Atmosphere?

    Is this statement right? Let me explain a few things about the chemistry of the atmosphere.There are two types of oxygen up there.O2 and 03.O2 is the result of CO2 bonding with 03.02 is what keeps the Earth warm.and it takes 40 YEARS for CO2 and other cfcs to make its way up into the atmosphere
  47. C

    High Voltage and Ozone: Process Overview

    Hi Group, I'm interested in how and why ozone is produced by high voltage discharges. I was hoping that if I give my impression of how the process works, people could correct any mistakes I've made. Here's how I think the process works: 1) Let's pretend a large high voltage arc is...
  48. R

    Ozone Layer: Questions & Answers

    I have a question about the ozone layer in our upper atmosphere. It is my understanding the the ozone is formed by hard radiation for the sun and space striking an O2 molecule and spitting it in two. The free oxygen atom then eventually finds another O2 molecule and attachs itself to...
  49. R

    Is Ozone Inhalation Safe for Humans?

    Saw an Ozone generator in dad's office.It reminded me of an article which said that ozone is harmful when inhaled. Is it really harmful?
  50. N

    Which part of the earth has less ozone ?

    Which part of the Earth has less ozone ? i am confused of it