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I Condensation inside the walls of a bottle.

  1. May 1, 2016 #1
    When I leave a closed half full bottle of water overnight, the next morning I find condensation on the inside walls of the bottle BUT! Only where sun light has reached it! I thought this was widely known and easy to explain, but I've been looking on the Internet for a while and haven't found a thing about it. Can someone explain to me why water doesn't condensate on the shaded side?
  2. jcsd
  3. May 1, 2016 #2

    Simon Bridge

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    Welcome to PF;
    Hang on ... misread.
    You are finding water droplets only on the sunny side and not on the shaded side?
    The condensation is due to cycling heat inside the bottle - persistent condensate means the air inside is hotter than outside - which will be more the case by the region in direct sunlight.

    Water droplets may also tend to clump more on the sunny side due to a local photostatic charge there.

    The process can be quite complicated - does it happen for all bottles placed there or just older ones?
    Last edited: May 1, 2016
  4. May 1, 2016 #3
    Yeah, that's what I ment. Sorry for my bad English, It's not my first language :C . Thank you for answering. I'm not sure but I think I've seen it in all bottles. I'm actualy planning on doing some experiments to see if it's light or heat the main cause. I'll upload a picture tomorrow.
    Thank you again for your answer.
  5. May 1, 2016 #4

    Simon Bridge

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    Compare glass and plastic bottles. Check them before the sun comes up too... then frequently as the sun rises.
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