Just How Deep Can we Go ??

[Mr T.]

This from the Smithsonian Institute in the US:

http://seawifs.gsfc.nasa.gov/OCEAN_P..._how_deep.html

Enjoy.

[Dr Stevil]

I've always thought it a bit of a coincidence that one of the guys who went down in the Trieste to Challenger Deep was called Piccard most definately to boldly go where no-one yadda yadda yadda...

[Dominic]

Before anyone starts planning to dive the Titanic, here's an interesting consideration:

The Titanic is at a depth of 3,820 meters
Therefore the pressure is at 383bar down there.

So if you took a 232 bar cylinder down with you, and opened it whilst you were there, instead of air coming out, water would go in.

Scary, huh?

[Dr Stevil]

<font color='#0000FF'>That's an excellent observation Dom, I'd never considered it like that.

Which makes me wonder if pressure does actually increase in strict linearity with depth, given the argument about the limits of compressibility usually given when discussing the pros &nbsp;&amp; cons of 300bar cylinders , ie at Challenger Deep, &nbsp;(11,042m deep) the pressure should be about 1131 bar, wouldn't liquid start behaving like a solid under those conditions ?
Do we have any fluid-dynamics physicists on the boards ?
just curious...
Chee-az
Steve

[Jay]

Originally Posted by [b

Quote[/b] (Steve W @ Mar. 11 2003,17:31)]Do we have any fluid-dynamics physicists on the boards ?

No but we got lots of fluidly dynamic piss artists

[Scoff]

&quot;The Titanic is at a depth of 3,820 meters
Therefore the pressure is at 383bar down there.

So if you took a 232 bar cylinder down with you, and opened it whilst you were there, instead of air coming out, water would go in.&quot;

But then, Dom, couldn't the excess pressure squeeze the tank like a toothpaste tube, and try to push out the air...??

Yeah, I failed my physics 'O'-level &nbsp;

Cheers

Scoff

Now about Boyle's Law....?

[Mark Scott-Simons]

Originally Posted by [b

Quote[/b] (Steve W @ Mar. 11 2003,17:31)]Which makes me wonder if pressure does actually increase in strict linearity with depth, given the argument about the limits of compressibility usually given when discussing the pros  &amp; cons of 300bar cylinders , ie at Challenger Deep,  (11,042m deep) the pressure should be about 1131 bar, wouldn't liquid start behaving like a solid under those conditions ?

Even at these pressures water remains almost totally incompressible. The density would increase from 1025kg/m^3 to 1061kg/m^3 ie only a few % more so the linear relationship between depth and pressure is still pretty good.

[Mark Scott-Simons]

Originally Posted by [b

Quote[/b] (Scoff @ Mar. 11 2003,22:51)]Therefore the pressure is at 383bar down there.
But then, Dom, couldn't the excess pressure squeeze the tank like a toothpaste tube, and try to push out the air...??

I'm fairly sure the cylinder would not have enough physical strength to resist the 383 - 232 = 151 Bar crushing force. But it wouldn't be like squeezing toothpaste. The cylinder would probably go with one hell of an implosion.

[Dominic]

Originally Posted by [b

Quote[/b] ]But then, Dom, couldn't the excess pressure squeeze the tank like a toothpaste tube, and try to push out the air...??

Dunno. Try it and let me know how it goes &nbsp;

[MATTBIN]

Wouldnt your mask implode before that? Come to that you'd get a hell of a squueze on the dry-suit in the lower regions, talk about pickled walnuts.
Matt