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Silence? Need to cause trouble!



Here are a couple of questions I've been wondering about.

In a thin layer of water that's heated from below and cooled from the top,
Bernard cells form. Question: do these cells always form with a hexagon
shell of descending flow, and where the acending flows are in the center
of each hexagon? Or does the pattern sometimes spontaneously organize
itself backwards, with the descending flows in the center, and the hexagon
walls composed of ascending flows? If the ascending warm flows are in the
center (or even USUALLY in the center), then... why?

Similar question: "dust devils" appear when there's an unstable
situation: a layer of low-density warm air near the ground, but do
"reverse" devils ever exist when there's a cool dense layer high in the
sky? Perhaps "reverse devils" are very rare because cool high air layers
are rare. But perhaps "reverse devils" cannot exist at all. If so...
why?


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William J. Beaty SCIENCE HOBBYIST website
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