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Thread: What is clean air ?

  1. #1 What is clean air ? 
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    Anyone knows what is clean air ? Does it contain argon ? N does clean air have a constant composition of oxygen n water vapour ?


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  3. #2  
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    I don't know if there is a specific definition of "clean air" - you might be better off turning it round and looking into what levels of pollutants exist or are considered harmful.

    But yes, it will contain argon: just under 1%. The level of oxygen (and carbon dioxide) changes (slightly) seasonally, caused by the uptake by plants.

    The level of water vapour will vary a lot depending on location, altitude, weather, temperature, etc.


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  4. #3  
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    Mountain air is normally considerd "clean" yet contains alot of bacteria and such natural stuff. Deducting from the opposit is man made chemicals, ultra fine particles from combustion and nano particles that can cause cancer.

    That's what I can come up with from on top of my head.
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  5. #4  
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    So quit breathing
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  6. #5  
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    Quote Originally Posted by HexHammer View Post
    Mountain air is normally considerd "clean" yet contains alot of bacteria and such natural stuff. Deducting from the opposit is man made chemicals, ultra fine particles from combustion and nano particles that can cause cancer.

    That's what I can come up with from on top of my head.
    hasn't mountain air got less O2?
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  7. #6  
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    percent wise No, just less of it.
    Clean air contains only air molecules.
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  8. #7  
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    Quote Originally Posted by fatman57 View Post
    hasn't mountain air got less O2?
    Very humid air also have less O2, so that doesn't just happen in mountains. This stuff occur because the water vapor displace the oxygen in the region thus creating a less percentage of O2 in the air. -eg: In one apocalyptic scenario I saw in a documentary about end-of-world-scenario the air became 'airless' (no breathable air) when that area was steamified by intense heat in the ocean and all the breathing gas migrated away from the area (ie: http://en.wikipedia.org/wiki/Aftermath_(TV_series)).

    Also, bacteria & virus in air is OK for us as long as it doesn't infect human. This is because those bacteria/virus probably shedded from plant & tree & leaves which isn't meant for us, but if we live in crowded place with humans or in crowded farm (eg: in pigs farm, because pigs can also be infected by human diseases) then that bacteria/virus could be a problem. In other word: all virus, fungus and bacteria only target specific host so bacteria in air is NOT a specific threat to us.
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  9. #8  
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    Clean air contains only air molecules.
    Depends what you mean. Air flows around the globe in much the same way as water does in the oceans and rivers - and plenty of critters, plants and processes hitch a ride.

    Wind-borne pollen fertilises plants away from the original plant. Air-borne dusts from the Himalayas replenish nutrients in the soils of China in much the same way as those same dusts are carried in Himalayas-originating rivers to deposit enriching silt in the deltas of Bangladesh and all the riverside land between.

    If we're looking for 'pure' air on the other hand, we have to go to places like Cape Grim in Tasmania. That air has travelled so far from other land areas that any pollutants or passenger particles have had maximum opportunity to precipitate out in snow and rainfall. By the time it gets to Cape Grim, you've got rainwater and air as 'pure' as you could find anywhere on the surface of the planet.
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  10. #9  
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    There is no such thing as an "air molecule". There are only molecules of various gases commonly found in air. Sorry being pedantic.
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  11. #10  
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    Bullshit- you know what l meant the components of air ie the gases- now stick it in yor pedantic butt.
    this forum gets more assinine daily
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  12. #11  
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    Quote Originally Posted by fizzlooney View Post
    Bullshit- you know what l meant the components of air ie the gases- now stick it in yor pedantic butt.
    this forum gets more assinine daily
    this gets me everytime - there are specific meanings for particle and molecule, so what word describes a collection of atoms that form a medium to which we would like to relate to in a very general sense?

    not even the word 'energy' can help us out here...

    opps - looks like my memory isn't too good - wiki defines particle as a perfectly good word to use....damn...(maybe it was the mention of size relation between individual components to a whole that got me thinking it was a more specific term...who knows!)....
    Last edited by fatman57; June 2nd, 2012 at 03:24 PM.
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  13. #12  
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    Quote Originally Posted by fizzlooney View Post
    Bullshit- you know what l meant the components of air ie the gases- now stick it in yor pedantic butt.
    this forum gets more assinine daily
    You could have made your point without resorting to insult.

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    "Air molecules" is often used as a catch all to mean the average constituent molecules.

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    Clean air simply refers to low amount of aerosols.
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  14. #13 Answer 
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    `The clean air`is a school term, describing so called perfect mixture of air gases: 78 % N2, 21 % O2, 1 % CO2 and other gases(in traces).
    *All % are Vol%.
    It has no practical purpose.
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  15. #14  
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    There is no such thing as an "air molecule".
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