Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Blue air bubbles on sand

  1. Feb 28, 2017 #1
    Hi all,
    Not sure it's the right place to ask but I found these while walking on the beach, they seemed to have come from the sea. They "explode" if you walk on them.
    Any ideas what this could be?

    https://ibb.co/fuL0gF
    https://ibb.co/ikrUaa
    https://ibb.co/hj3LgF

    Thanks,

    Audry
     
  2. jcsd
  3. Feb 28, 2017 #2

    lewando

    User Avatar
    Gold Member

    Could be Portuguese Man 'o War (aka "blue bottle") jellyfish.
     
  4. Feb 28, 2017 #3

    Baluncore

    User Avatar
    Science Advisor

  5. Feb 28, 2017 #4

    jim mcnamara

    User Avatar

    Staff: Mentor

    Don't pick one up. Particularly do not touch the 'tentacle' like thing. It is VERY painful, even for long time after the bladder washes up on the beach.
     
  6. Mar 1, 2017 #5

    Fervent Freyja

    User Avatar
    Gold Member

    Oh, I would love to try and preserve one of these! Beautiful.
     
  7. Mar 1, 2017 #6

    davenn

    User Avatar
    Science Advisor
    Gold Member

    Yup ..... in Australia these are the blue bottle jellyfish .... nasty little beasts .... have been stung by them ... very painful

    https://australianmuseum.net.au/bluebottle

    Dave
     
  8. Mar 1, 2017 #7

    DrDu

    User Avatar
    Science Advisor

    What is maybe interesting is the fact that the gas bubbles contain up to 12% of Carbon monoxide which is synthesized by a specialized organ from serine.
     
  9. Mar 1, 2017 #8
    Do they use that CO in their metabolic processes? or is it the product of such processes to be exuded?

    12 % in humans would be fatal for sure.
     
  10. Mar 2, 2017 #9

    jim hardy

    User Avatar
    Science Advisor
    Gold Member
    2016 Award

    Those darn things cause in me intense and extreme revulsion. They're a real hazard at the beaches around Miami where i grew up.
    When in the water their tentacles dangle down a couple feet to trap unfortunate little fish. If one just brushes you it deposits a toxin that gives excruciating pain in a line where it touched. It raises welts and burns for hours.
    I remember as a kid getting a mild hit just once. I'll never forget the sight of a lady who didn't know what they are and swum up under one , writhing in pain trying to pick it off her arms. . The lifeguard was wiping her down with ammonia. It had got her upper arms shoulder and back. She was in serious pain.

    What a horrid death for its prey.
    http://www.norbertwu.com/nwp/behaviors-themes/animals_feeding_web/originals/8562.JPG
    manowar.jpg

    "Did He who made the Lamb make thee ? "
    One of His mistakes , i'd say.

    old jim
     
  11. Mar 2, 2017 #10

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    Those are Tygers, I believe.
     
  12. Mar 2, 2017 #11

    Baluncore

    User Avatar
    Science Advisor

    They rise and fall by inflating or deflating the float. I believe that the CO is produced to provide the buoyancy.
    See; http://jeb.biologists.org/content/jexbio/37/4/698.full.pdf
    The Source Of Carbon Monoxide In The Float Of The Portuguese Man-Of-War, Physalia Physalis. By Jonathan B. Wittenberg. (April 1960). Conclusion 5: "It is suggested that carbon monoxide secretion serves to inflate the float of Physalia and that carbon monoxide is later slowly replaced by air through diffusion and exchange".

    The “Portuguese man o' war” or Blue Bottle can be painful but is only very rarely fatal.
    I believe a bigger mistake than the Blue Bottle was the Box Jellyfish or "Sea Wasp" that kills many people each year.
    https://en.wikipedia.org/wiki/Box_jellyfish#Danger_to_humans

    But only a devil could have conceived the "Irukandji jellyfish", Carukia barnesi, et al. It is the most venomous jellyfish known, is usually invisible with a medusa only 5mm across, but has fine tentacles about a metre long. Luckily there are few people swimming in Northern Australian waters.
    https://en.wikipedia.org/wiki/Irukandji_jellyfish
     
  13. Mar 8, 2017 #12

    Baluncore

    User Avatar
    Science Advisor

    Just happened across this when surfing the web for hydrodynamics.
    Those bubbles on the sand are certainly advanced technology.

    Why does it have a sail? Because it is a trawler.

    “Hydrodynamics of sailing of the Portuguese man-of-war Physalia physalis”
    By G. Iosilevskii and D. Weihs, 15 December 2008.
    See, Download the pdf from; http://rsif.royalsocietypublishing.org/content/6/36/613
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Blue air bubbles on sand
  1. Blue Water (Replies: 4)

  2. Viscosity of air (Replies: 3)

Loading...