The Boxing Glove Shrimp (not kosher)

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  • #589244
    feivel
    Participant

    Among the fascinating creatures of the deep is a finger-size shrimp with an oversize claw resembling a boxing glove that it uses to stun its prey by snapping the claw shut. The snapping produces a sharp cracking sound.

    When colonies of the shrimp snap their claws, the cacophony is so intense that submarines can take advantage of it to hide from sonar.

    Lohse and his colleagues reported in the September 22, 2000, issue of “Science” that the stunning snap comes not from the clap of the claws coming together but from a bubble generated by the claws’ rapid closing motion.

    When the claw snaps shut, a jet of water shoots out from a socket in the claw at speeds of up to 62 miles an hour, generating a low-pressure bubble in its wake. As the pressure stabilizes, the bubble collapses with a loud bang.

    The researchers have dubbed the shrimp activity shrimpoluminescence.

    The researchers say the light emitted from the snapping shrimp’s bubbles suggests that the temperature inside the bubbles must be at least 8,540 degrees Fahrenheit at the time of collapse. (the melting point of structural steel is approximately 2,750 degrees F)

    The duration of the flash that occurs when the main bubble collapses is extremely short, lasting no longer than 10 nanoseconds and as short as 300 picoseconds, said Lohse. A picosecond is one trillionth of a second, a time scale beyond the measurement capability of the researchers’ tools.

    just to sum up: a little shrimp moves its claws with such rapidity and control (coordinated with another complex integrated system that shoots a jet of water precisely timed to the exceedingly rapid closing of the jaws) creating the necessary bubble to create a light flash hotter than the hottest fire in the world, and an extremely intense sound.

    of course the shape and functional structure of the claw as well as the structures that it hinges on, the muscles, nerves, central nervous system, have to be specifically and complexly INTEGRATED with the central and peripheral control mechanisms of the other behaviors of the little shrimp, as well as touch, vision, smell, and sight.

    in what varied, complex and wondrous ways has the Boreh kindly demonstrated for us His wisdom, planning and cunningness in The World, TO STRENGTHEN OUR EMUNAH!!

    #634909
    moish01
    Member

    feivel, the closest i could get to that was a goldfish. or else i could get you a turtle, a seahorse or a shark. oh well.

    #634910
    SJSinNYC
    Member

    Feivel, does this principle work similiar to water hammer?

    BTW this creature is every cool. Do they know WHY this creature needs such a loud bubble with such a hot burst? Does it have a known purpose for the creature?

    #634911

    SJSinNYC-

    Not really.

    Water hammer is caused by liquid (which is not compressible) coming to a sudden stop. The force of this jolting stop can actually break pipes. There are “air cushions” (I forget their actual name – they are basically empty tubes, sometimes twisted in a spiral, installed upside-down to keep their air bubble) that are sometimes installed by a sink, atop the hot and cold water lines, specifically to allow air compression and prevent “water hammer” when the faucet is suddenly flipped off.

    What “feivel” is describing is cavitation, which occurs when something (i.e. a submarine’s screw – this is a bane of submariners trying to avoid detection) is moving thru the water so quickly that the water separates, leaving a “bubble” that quickly closes again.

    #634912
    SJSinNYC
    Member

    ICOT, I need to think about that a bit. Just remember, there are two types of water hammer (not saying you are wrong, just clarifying).

    #634913

    SJSinNYC-

    I’m not sure what you mean by “two types”.

    Do you mean condensed water in a steam-heat system, as well as water in regular hot and cold water pipes?

    #634914
    SJSinNYC
    Member

    One is actually pressure waves and one is the bubble collapse.

    I have a great explanation at work, but wont be back until monday.

    #634915

    SJSinNYC-

    I’m not at all familiar with “bubble collapse” water hammer, but that does sound like part two of cavitation (part one being when the cavity forms).

    I’m sure Con Ed engineers are more knowledgeable than yours truly about fluid dynamics, as well as other things needed for power generation (hydroelectric, steam generation for Manhattan, etc.)

    “…wont be back until monday” – Will my lights stay on until then?

    #634916
    teen
    Member

    hmm intresting…guess its true that u learn something new every day…i learned 2…never heard of a water hammer

    #634918
    SJSinNYC
    Member

    ICOT, I think they might be able to stay on without me. I’ll put in a special call!

    I am no expert in water hammer or cavitation AT ALL. Cavitation is sort of different than the bubble collapse water hammer, but I am not the best at explaining it. I wish I knew more. But I will definitely run this past some experts and see what they say (about this creature).

    #634919

    SJSinNYC-

    I can’t claim to be an expert, either.

    I know a bit about household plumbing, which is where my knowledge of water hammer comes from (both water pipes and steam-heat systems).

    Tom Clancy gets the credit for my “cavitation” knowledge, since he mentions it in at least two of his books.

    #634920
    feivel
    Participant

    sj

    it is to scare off predators

    #634921
    moish01
    Member

    feivel, i love how you wrote “not kosher” in parenthesis. i keep looking at it.

    #634922
    teen
    Member

    moish01: thanx now i cant stop ooking at it lol

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