Gue Vs Tdi

[MXGratefulDiver]

and what is TENSION, professor?

... it's what he feels after engaging in one of these discussions ...

... Bob (Grateful Diver)

 

[nova]

and what is TENSION, professor?

c:ar-chaicRESSURE, Websters. THANKS lamont. All the clues are there and yet nobody can see that it was Mr. Musturd with a candlestick in the library

 

[cornfed]

c:ar-chaicRESSURE, Websters. THANKS lamont. All the clues are there and yet nobody can see that it was Mr. Musturd with a candlestick in the library

If it's so elementry why don't you point us in the right direction, my dear Watson?

Here is a passage from and article by Wienke. On page 22, he writes,

Denoting the ambient partial pressure of a gas, p, and its solubility, S, in a liquid, the relative concentration of the dissolved gas component, c, is given by Henry's law,

c = Sp

The corresponding tension, or dissolved gas partial pressure, is also p at equilibrium. By convention, partial pressures usually refer to the free gas phase, while tensions refer to the dissolved gas phase, though some folks use them interchangeably. When there exist differences, or gradients, between gas partial pressures and/or tensions across regions of varying concentration or solubility, gases will diffuse until partial pressures are equal, in short, move from regions of higher partial pressures to regions of lower partial pressures, regardless of the phases (free or dissolved) of the components. This movement is the crux of the decompression problem in divers and aviators, and modeling this movement is central to the formulation of decompression tables and dive computer algorithms.

Nova, would you please answer the question I posed in post #179? And before you make another cute comment without actually answering anything I'd like to point out that not only is Col. Mustard in passage I quoted, but he's holding the candlestick too.

 

[nova]

If it's so elementry why don't you point us in the right direction, my dear Watson?

Here is a passage from and article by Wienke. On page 22, he writes,


Nova, would you please answer the question I posed in post #179? And before you make another cute comment without actually answering anything I'd like to point out that not only is Col. Mustard in passage I quoted, but he's holding the candlestick too.

what part of "passing from higher PRESSURE to lower PRESSURE " don't you not understand. It's obvious that "something " must be pressurised .Wienke even says tension and pressure are interchangable( when talking about diving)

reread the whole Weinke quote you posted and tell me what pressure means to you.and tell me if a divers veins add pressure to equalize the added pressure of depth , or do they collapse if the heart stops pumping

Decompression, pressure group, partial pressure, ambient pressure, gradient pressure,totall pressure. and as a kicker , when you test nitrox the tester gives the pressure of O2 in the tank. because the tank is at 1 ata you can think of it as a percentage. All these things are pressure related (just like diving)

 

[cornfed]

what part of "passing from higher PRESSURE to lower PRESSURE " don't you not understand. It's obvious that "something " must be pressurised .

What's passing from higher to lower pressure? If you can answer the question I posed in post #179 you will see my point.

reread the whole Weinke quote you posted and tell me what pressure means to you.and tell me...

No. I won't answer any of your questions until you've answered mine. I feel I've been reasonable with you in public (twice since you restarted this thread) and in private. I've tried (in great detail) to explain my position yet you refuse to return the favor. I'm not going to discuss this with you anymore until you answer my question,

"If volume and temperature are constant how does the pressure change?"

 

[Doppler]

"If volume and temperature are constant how does the pressure change?"

Drew: I've kept out of this so far, but feel I must say someting now... and I am surprised you don't already know: It's all due to small uniformed ushers who push extra people onto the subway trains in Tokyo.

 

[nova]

What's passing from higher to lower pressure? If you can answer the question I posed in post #179 you will see my point.

No. I won't answer any of your questions until you've answered mine. I feel I've been reasonable with you in public (twice since you restarted this thread) and in private. I've tried (in great detail) to explain my position yet you refuse to return the favor. I'm not going to discuss this with you anymore until you answer my question,

"If volume and temperature are constant how does the pressure change?"

pressure causes compression ( for the farm animals that means things get smaller)which means VOLUME doesn't stay the same. As Weinke pointed out to you , high pressure moves to low pressure for equalibrium

and you have not been reasonable, because a reasonable diver would understand that it's the rapid change of GAS PRESSURE that causes the bends with all inert gasses

And feel free not to discuss this anymore because you obviously don't understand the answer in short pressure-volume relationship is known as BOYLE'S LAW which means volume is inversely related to pressure or volume is not a constant

 

[WarmWaterDiver]

Cheezit everyone - it's the Judge Dredd of the Molecule Police - "I am THE LAW!"

 

[JeffG]

pressure causes compression ( for the farm animals that means things get smaller)which means VOLUME doesn't stay the same. As Weinke pointed out to you , high pressure moves to low pressure for equalibrium

Still didn't answer his question.

"If volume and temperature are constant how does the pressure change?"
Pressure can be increased by introducing more of the material under pressure.

 

[lamont]

pressure causes compression ( for the farm animals that means things get smaller)which means VOLUME doesn't stay the same. As Weinke pointed out to you , high pressure moves to low pressure for equalibrium

and you have not been reasonable, because a reasonable diver would understand that it's the rapid change of GAS PRESSURE that causes the bends with all inert gasses

And feel free not to discuss this anymore because you obviously don't understand the answer in short pressure-volume relationship is known as BOYLE'S LAW which means volume is inversely related to pressure or volume is not a constant

boyle's law does not govern offgassing from dissolved gas to free phase gas due to oversaturation of tissue tension compared to ambient pressure. boyle's law governs expansion (or contraction) of free phase gas, but you haven't described how the free phase gas got there in the first place.