Is air invisible?

Google pixel2
Nov 3, 2018 33 Comments

Just had a nice discussion with myself in the shower. What do you think?

I think that the only invisible thing is vacuum, everything else reflects at least a portion of the EM spectrum

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TOP 33 Comments
  • Google pixel2
    OP
    Follow-up for those who say it is invisible: what's the biggest invisible thing / smallest visible thing for you?
    Nov 3, 2018 1
    • Flagged by the community.

  • eBay / Eng
    seaBay

    eBay Eng

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    Amazon, Microsoft
    seaBaymore
    Arguing definitions is a fool's errand. I don't think anyone here disagrees about the facts of the physical phenomena, therefore there is no disagreement.

    If you don't already agree that it's a meaningless question, I encourage you to read this: https://www.lesswrong.com/posts/7X2j8HAkWdmMoS8PE/disputing-definitions
    Nov 3, 2018 2
    • Google pixel2
      OP
      Interesting article. In my mind this is more about people's working definition than which definition is correct (which is what comes up in the article). It's an experiment to collect empirical stats on using the term invisible, not a shouting match about which definition is 'superior'. I never meant to imply anyone is incorrect, I'm just interested in the consequences and inconsistencies of both definitions
      Nov 3, 2018
    • eBay / Eng
      seaBay

      eBay Eng

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      Amazon, Microsoft
      seaBaymore
      Thanks for clarifying. It wasn't clear to me from reading the post.
      Nov 3, 2018
  • Is it safe to get high in the shower?
    Nov 3, 2018 2
    • Google pixel2
      OP
      When you're high on life like me you don't need drugs :-)
      Nov 3, 2018
    • Microsoft IEjP42
      But they help
      Nov 3, 2018
  • Google nlogn
    No. Molecules scatter light off. That's why a clear sky is blue.
    Nov 3, 2018 3
    • Google pixel2
      OP
      Is anything invisible then?
      Nov 3, 2018
    • Square Jqty44
      It depends on the wavelength of the light (em radiation). Air is pretty much invisible to radio waves for example.
      Nov 3, 2018
    • Google pixel2
      OP
      So invisible just means that it's smaller wavelength than whatever you're observing with? I e smaller than 300 nm for eyes? That doesn't quite make sense because you also can't see things larger than 300nm though they're "observable" with visible light
      Nov 3, 2018
  • Amazon smack
    The vacuum is not invisible either, it is full of the cosmic microwave background radiation at one level and the quantum froth at another.
    Nov 3, 2018 2
    • Google pixel2
      OP
      Interesting. Do you consider anything to be invisible?
      Nov 3, 2018
    • Google pixel2
      OP
      I think I consider em waves invisible. It's not the same as undetectable to me
      Nov 3, 2018
  • Akamai Technologies / Eng Ihnn
    SNWE (Saturday night weed effects) 🤔
    Nov 3, 2018 0
  • Autodesk / Eng Vjvcjko
    Everything about universe looks different at different spatiotemporal.
    Nov 3, 2018 2
    • Google pixel2
      OP
      Not sure if I follow. Can you elaborate
      Nov 3, 2018
    • Autodesk / Eng Vjvcjko
      Spatiotemporal is like perspectives, if you look at a situation from different space and time it seems different every time, similarly universe looks different for a cat/dog/human it is different for every naked eye. Sometimes there is no reality other than what is perceived by your eyes and brain.
      Nov 3, 2018
  • TrueCar / Eng
    expbackoff

    TrueCar Eng

    PRE
    Microsoft
    expbackoffmore
    If you think about it from a state of matter perspective, it might become much easier to go to the answer or it could just end up increasing our curiosity. Either way we'll be at a better state of knowledge or understanding.

    For what it's worth, it's not invisible.

    But I cannot explain you that because you might not understand it, I would say.

    https://youtu.be/36GT2zI8lVA - watch it, please?.
    Nov 3, 2018 2
    • Google pixel2
      OP
      Just finished watching - incredible. But I do think that invisibility is not as basic of a concept as an electromagnetic force
      Nov 3, 2018
    • Google pixel2
      OP
      It should be explainable
      Nov 3, 2018
  • Apple / Eng pMoI16
    Wtf did you smoke?
    Nov 3, 2018 1
    • Google pixel2
      OP
      "every day is a blast if you have a cinema in your mind but it's good to come out when the movie ends."
      Nov 3, 2018
  • Symantec O (1)
    How come vaccum is invisible?
    Nov 3, 2018 7
    • Symantec O (1)
      You can see through air.
      Nov 3, 2018
    • Google pixel2
      OP
      Air is opaque, true that you can see through a little bit of air but you can also see through a little bit of glass and it isn't invisible. I suspect that if you looked through light-years and light-years of air you wouldn't see anything on the other side
      Nov 3, 2018
    • Amazon / Eng
      ime&myself

      Amazon Eng

      PRE
      Sabre Corporation
      ime&myselfmore
      Pixel2 space is filled with gamma radiation, photons, radons and dark matter. Does it still count as vacuum? Is absolute vacuum possible?
      Nov 3, 2018
    • Google pixel2
      OP
      Agreed, I'm not sure if photons are invisible but dark matter certainly is. Do you think photons are invisible or just very very small?
      Nov 3, 2018
    • Amazon / Eng
      ime&myself

      Amazon Eng

      PRE
      Sabre Corporation
      ime&myselfmore
      They are visible. Many physicists observed photons. I think they are just too small for the naked eye.
      Nov 3, 2018
  • Equilar ByByte
    I saw it today, around the corner
    Nov 3, 2018 0