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Guinness bubbles really do sink.

Discussion in 'The Lounge' started by jjlaughner, Mar 22, 2004.

  1. jjlaughner

    jjlaughner 3/4 ton status

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    People celebrating St. Patrick's Day Wednesday can cross one topic of conversation off their lists.

    [​IMG]
    Guinness bubbles really do sink.

    Scientists said Monday they had finally proved that the dark stout's creamy bubbles defy expectations and flow down instead of upwards.

    "Our group carried out preliminary experiments at a local pub a few years ago, but the results proved inconclusive," said Dr. Andrew Alexander, from the University of Edinburgh's School of Chemistry.

    They first thought the dark liquid flowing down as a pint was poured gave the illusion the bubbles were going down as well.

    Now close examination has revealed that, as a pint settles, bubbles touching the walls of the glass experience drag, similar to that a person feels sliding their finger along glass, and that prevents them floating up.

    The bubbles in the middle however, are free to rise, creating a circular flow within the glass that causes bubbles at the edge to be pushed downwards on the inside surface of the glass.

    The Edinburgh team, working with researchers at Stanford University in California have produced high-speed video footage of the sinking bubbles -- to put at rest the minds of any drinkers who might have felt they were seeing things.
     
  2. jakeslim

    jakeslim 1/2 ton status

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    taste like a glass of soy sauce...not for me /forums/images/graemlins/shame.gif
     
  3. Resurrection_Joe

    Resurrection_Joe 1 ton status

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    I've never had Guinnes, but if it really tastes like soy sauce, sign me up!
     
  4. Bullet

    Bullet 1/2 ton status

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    Isn't it because the bubbles are composed of Nitrogen?

    /forums/images/graemlins/dunno.gif
     
  5. Corey 78K5

    Corey 78K5 1 ton status

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    With out a dout the best stout ever made /forums/images/graemlins/bow.gif /forums/images/graemlins/bow.gif /forums/images/graemlins/bow.gif
     
  6. BlueBlazer

    BlueBlazer 1/2 ton status

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    Damn right, you guys ever had a snakebite, Guiness and Woodchuck, I could drink that stuff every night.
     
  7. jjlaughner

    jjlaughner 3/4 ton status

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    [ QUOTE ]
    Damn right, you guys ever had a snakebite, Guiness and Woodchuck, I could drink that stuff every night.

    [/ QUOTE ]

    HELL YEAH! PSSST... you for got harps and bass /forums/images/graemlins/waytogo.gif
    BLACK n' TANs all day long!
     
  8. jjlaughner

    jjlaughner 3/4 ton status

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    [ QUOTE ]
    Isn't it because the bubbles are composed of Nitrogen?

    /forums/images/graemlins/dunno.gif

    [/ QUOTE ]

    Have you seen the disks in the cans? Like a little nitrogen filled frisbie looking thing. Draft is by far the best though.
     
  9. chevyfumes

    chevyfumes Court jester

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    /forums/images/graemlins/peace.gifduh Guinness rocks...
     
  10. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    There is a BIG difference between US Guinness and UK Guinness in taste and thickness!JMO! I like UK's version better! /forums/images/graemlins/peace.gif
    Bill
     
  11. bigburban383

    bigburban383 1/2 ton status

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    [ QUOTE ]
    People celebrating St. Patrick's Day Wednesday can cross one topic of conversation off their lists.

    [​IMG]
    Guinness bubbles really do sink.



    [/ QUOTE ]

    Dude are you kidding. Read this slowly and carefully:

    "Now close examination has revealed that, as a pint settles, bubbles touching the walls of the glass experience drag, similar to that a person feels sliding their finger along glass, and that prevents them floating up.

    The bubbles in the middle however, are free to rise, creating a circular flow within the glass that causes bubbles at the edge to be pushed downwards on the inside surface of the glass."

    The bubbles dont sink, they are forced down by the circular motion of the bubbles on the inside not touching the walls.
     

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