Kind of like smoke rings, only in the water and by Dolphins.
This is really interesting - after reading it, watch the attached video.
Lots better than politics! To enlarge to full-screen size, click the small
box with an arrow inside it - at the extreme lower right corner of your
screen.
The attached video is of dolphins playing with silver colored rings which
they have the ability to make under water to play with. It isn't known how
they learn this, or if it's an inbred ability.
As if by magic the dolphin does a quick flip of its head and a silver ring
appears in front of its pointed beak.The ring is a solid, donut shaped
bubble about 2-ft across, yet it doesn't rise to the surface of the water!
It stands upright in the water like a magic doorway to an unseen dimension.
The dolphin then pulls a small silver donut from the larger one.
Looking at the twisting ring for one last time a bite is taken from it,
causing the small ring to collapse into a thousands of tiny bubbles which
head upward towards the water's surface.
After a few moments the dolphin creates another ring to play with. There
also seems to be a separate mechanism for producing small rings, which a
dolphin can accomplish by a quick flip of its head.
An explanation of how dolphins make these silver rings is that they are
'air-core vortex rings'.Invisible, spinning vortices in the water are
generated from the tip of a dolphin's dorsal fin when it is moving rapidly
and turning.
When dolphins break the line, the ends are drawn together into a closed
ring. The higher velocity fluid around the core of the vortex is at a lower
pressure than the fluid circulating farther away.
Air is injected into the rings via bubbles released from the dolphin's blow
hole. The energy of the water vortex is enough to keep the bubbles from rising for
a reasonably few seconds of play time.
This is really interesting - after reading it, watch the attached video.
Lots better than politics! To enlarge to full-screen size, click the small
box with an arrow inside it - at the extreme lower right corner of your
screen.
The attached video is of dolphins playing with silver colored rings which
they have the ability to make under water to play with. It isn't known how
they learn this, or if it's an inbred ability.
As if by magic the dolphin does a quick flip of its head and a silver ring
appears in front of its pointed beak.The ring is a solid, donut shaped
bubble about 2-ft across, yet it doesn't rise to the surface of the water!
It stands upright in the water like a magic doorway to an unseen dimension.
The dolphin then pulls a small silver donut from the larger one.
Looking at the twisting ring for one last time a bite is taken from it,
causing the small ring to collapse into a thousands of tiny bubbles which
head upward towards the water's surface.
After a few moments the dolphin creates another ring to play with. There
also seems to be a separate mechanism for producing small rings, which a
dolphin can accomplish by a quick flip of its head.
An explanation of how dolphins make these silver rings is that they are
'air-core vortex rings'.Invisible, spinning vortices in the water are
generated from the tip of a dolphin's dorsal fin when it is moving rapidly
and turning.
When dolphins break the line, the ends are drawn together into a closed
ring. The higher velocity fluid around the core of the vortex is at a lower
pressure than the fluid circulating farther away.
Air is injected into the rings via bubbles released from the dolphin's blow
hole. The energy of the water vortex is enough to keep the bubbles from rising for
a reasonably few seconds of play time.
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