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'Brinicle' ice finger of death

  1. Nov 23, 2011 #1


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    Amazing footage by BBC Nature, I had to share:

    Last edited by a moderator: Sep 25, 2014
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  3. Nov 23, 2011 #2


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    This absolutely brilliant documentary series (Frozen Planet) is on tonight at 9 on BBC 1. Well worth a watch!
  4. Nov 23, 2011 #3


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    I love David Attenborough's voice!!! I bought the BBC version of Planet Earth just because he narrated it - not the US Susan Sarandon version.
    Last edited: Nov 23, 2011
  5. Nov 24, 2011 #4


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    We have "Planet Earth" queued up for the holiday so we can revisit this classic over a period of days and avoid the tripe that the networks are selling as "classics".

    I'm no business-entertainment guru, but I'll be willing to bet that if a cable channel would loop Planet Earth continuously, parents would set their cable channel permissions accordingly. Their children would at least be a bit better educated.

    Perhaps I'm a bit optimistic regarding the motivations of the parents....
  6. Nov 24, 2011 #5

    Andy Resnick

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  7. Nov 24, 2011 #6
    Can someone explain the physics involved here? I can understand seawater being liquid at say -3 C, and fresh water would freeze at this temperature, although not as fast as it appears to here. Why would fresh water sink in seawater? Fresh water has a maximum density at +4 C and becomes less dense at lower temperatures. That's why ice forms on the surface and floats.

    EDIT: OK. I missed the first sentence the first time I saw this. This is a stream of liquid brine at a lower temperature than the seawater. Because of its high salinity the brine "finger" remains liquid, but the less saline seawater has a higher freezing point and freezes around the liquid column as the heavy brine descends. Fascinating.
    Last edited: Nov 25, 2011
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