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Author Topic: Mushroom cloud  (Read 2573 times)

paul.fr

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Mushroom cloud
« on: 07/04/2007 22:28:15 »
I thought this may have previously been asked, but i can't find it! Why are mushroom clouds that shape?


 

Offline Karen W.

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Mushroom cloud
« Reply #1 on: 07/04/2007 22:32:01 »
OH Scared me!!!!
 

another_someone

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Mushroom cloud
« Reply #2 on: 08/04/2007 01:32:29 »
I am guessing, but I always assumed it was just that the heat of the cloud caused the cloud to lift off the ground, leaving a smaller tail underneath it.
 

paul.fr

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Mushroom cloud
« Reply #3 on: 08/04/2007 02:08:33 »
Ah, so the heat causes the stalk/stem of the mushroom and as it cools the cloud falls and produces the body shape...is that about right?
 

another_someone

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Mushroom cloud
« Reply #4 on: 08/04/2007 11:22:09 »
As I said, I am only guessing, so maybe someone might correct me.

I would guess that the cloud is made of of lots of dust suspended in hot air (or even plasma).

Initially, the blast just moves out in a sphere.  This sphere, being hot, lifts off the ground, leaving a partial vacuum behind it, and this partial vacuum drags more dust up from the surface.  The sphere becomes the crown of the mushroom, while the dust dragged up in its wake becomes the stalk.

As the mushroom cloud rises, it could even create its own convection currents, like a tornado, with an updraft of hot air at its centre, and a downdraft as the air cools at the periphery.
 

Offline DoctorBeaver

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Mushroom cloud
« Reply #5 on: 10/04/2007 08:16:43 »
George is spot on as usual.
 

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Mushroom cloud
« Reply #5 on: 10/04/2007 08:16:43 »

 

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