Re: implosions

Posted by john in la on July 02, 2023 at 10:03:21 from (97.80.68.11):

In Reply to: Re: implosions posted by redforlife on July 02, 2023 at 08:14:10:

Running over a tube with a steam roller will pop the tube.
The pressure from the roller will be lets say 6000 lbs (only as a good example for the water depth) and the pressure from the ground will be the same 6000 lbs.
But the sides will have no pressure (space between the roller and the ground).
So the tube will pop as it stretches out to the sides.
That is not true under water.

First if we send a metal cylinder down in the water (A sub)
The air pressure in the sub will be 14 psi same as we feel here on the surface.
As the sub goes down the cylinder stays the same size and the pressure inside stays the same while the water pressure outside increases the deeper we go.
Once we get deep enough the structure can no longer hold the pressure from outside the sub will imploded until a crack forms and water rushes in or the air pressure inside becomes the same as the outside water pressure.

But if we send a tire tube down with 25 psi of air in it.
The tube is not rigid like a metal sub.
The tube is flexible.
So as we go down the water pressure outside the tube will be pushing on every sq inch of the tube.
The tube will get smaller in size as we go down from the high water pressure pushing on the 25 psi air on the inside.
As the water pressure increases the air pressure inside the tube will increase to the same pressure.
Eventually we will hit bottom and the water pressure outside will be 6000 psi and the air pressure inside will be 6000 lbs with the shrunk tube just being a layer of rubber between the air and water.

Now lets take this same tube and rather than diving deep lets go up in the sky.
As we get higher and higher the air pressure on the outside of the tube will decrease.
This will cause the pressure inside to tube to expand.
Once the tube gets so big it can not expand any more the tube will rip.

So it is not the pressure in or out of the tube that allows the air to leak out.
It is the stretching of the tube beyond its limits that will pop it.
Stretching the tube is not a factor under the water.

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