Waders - Thanks everybody
 

On Fri, 9 Jul 2004, riverman wrote:

But, back to the GoreTex waders question. I've always wondered if there was
any value to being breathable when you are standing hip-deep in water? It
seems that the vapors would not move through a semipermeable membrane from a
region of lesser humidity to a region of higher.

Don't you know that the Gore brand of breathables incorporate a
nanotechnology which allows it to function as a reverse-osmosis (aka
active transport) device ;)
__________________________________________________ _____________________
\ Mu Young Lee
remove all dashes and underscores in reply address

Waders - Thanks everybody
 

On Fri, 9 Jul 2004, riverman wrote:

But, back to the GoreTex waders question. I've always wondered if there was
any value to being breathable when you are standing hip-deep in water? It
seems that the vapors would not move through a semipermeable membrane from a
region of lesser humidity to a region of higher.

Don't you know that the Gore brand of breathables incorporate a
nanotechnology which allows it to function as a reverse-osmosis (aka
active transport) device ;)
__________________________________________________ _____________________
\ Mu Young Lee
remove all dashes and underscores in reply address

Waders - Thanks everybody
 

"Mu Young Lee" wrote in message
. itd.umich.edu...
On Fri, 9 Jul 2004, riverman wrote:

But, back to the GoreTex waders question. I've always wondered if there
was
any value to being breathable when you are standing hip-deep in water?
It
seems that the vapors would not move through a semipermeable membrane
from a
region of lesser humidity to a region of higher.

Don't you know that the Gore brand of breathables incorporate a
nanotechnology which allows it to function as a reverse-osmosis (aka
active transport) device ;)

Well, since the key is osmotic pressure, somehow we have to make the partial
pressure of the water vapor inside the waders higher than the PP of the
water vapor in the river, which is approaching 100%. Hmmm, other than
pressuring your waders with distilled water, I don't see how any micropore
layer functions underwater! Gore claims it on their website, but provides no
explanation. I've seen those demonstrations at REI where there is a sealed
beaker underwater with a heating element inside it, and the air bubbles are
escaping into the water. But they are ignoring the vapor pressure of the
boiling water...

Nope, still doesn't make any sense to me. GoreTex functions best as a
bilayer barrier when the air temps (hence the carrying capacity/humidity)
difference is greatest, and the outside air is considerably more dry than
the inside air. Skiing comes to mind, and I know goretex jackets are
excellent in the winter, but I have no idea if they actually breathe
underwater.

--riverman

Waders - Thanks everybody
 

"Mu Young Lee" wrote in message
. itd.umich.edu...
On Fri, 9 Jul 2004, riverman wrote:

But, back to the GoreTex waders question. I've always wondered if there
was
any value to being breathable when you are standing hip-deep in water?
It
seems that the vapors would not move through a semipermeable membrane
from a
region of lesser humidity to a region of higher.

Don't you know that the Gore brand of breathables incorporate a
nanotechnology which allows it to function as a reverse-osmosis (aka
active transport) device ;)

Well, since the key is osmotic pressure, somehow we have to make the partial
pressure of the water vapor inside the waders higher than the PP of the
water vapor in the river, which is approaching 100%. Hmmm, other than
pressuring your waders with distilled water, I don't see how any micropore
layer functions underwater! Gore claims it on their website, but provides no
explanation. I've seen those demonstrations at REI where there is a sealed
beaker underwater with a heating element inside it, and the air bubbles are
escaping into the water. But they are ignoring the vapor pressure of the
boiling water...

Nope, still doesn't make any sense to me. GoreTex functions best as a
bilayer barrier when the air temps (hence the carrying capacity/humidity)
difference is greatest, and the outside air is considerably more dry than
the inside air. Skiing comes to mind, and I know goretex jackets are
excellent in the winter, but I have no idea if they actually breathe
underwater.

--riverman

Waders - Thanks everybody
 

"Mu Young Lee" wrote in message
. itd.umich.edu...
On Fri, 9 Jul 2004, riverman wrote:

But, back to the GoreTex waders question. I've always wondered if there
was
any value to being breathable when you are standing hip-deep in water?
It
seems that the vapors would not move through a semipermeable membrane
from a
region of lesser humidity to a region of higher.

Don't you know that the Gore brand of breathables incorporate a
nanotechnology which allows it to function as a reverse-osmosis (aka
active transport) device ;)

Well, since the key is osmotic pressure, somehow we have to make the partial
pressure of the water vapor inside the waders higher than the PP of the
water vapor in the river, which is approaching 100%. Hmmm, other than
pressuring your waders with distilled water, I don't see how any micropore
layer functions underwater! Gore claims it on their website, but provides no
explanation. I've seen those demonstrations at REI where there is a sealed
beaker underwater with a heating element inside it, and the air bubbles are
escaping into the water. But they are ignoring the vapor pressure of the
boiling water...

Nope, still doesn't make any sense to me. GoreTex functions best as a
bilayer barrier when the air temps (hence the carrying capacity/humidity)
difference is greatest, and the outside air is considerably more dry than
the inside air. Skiing comes to mind, and I know goretex jackets are
excellent in the winter, but I have no idea if they actually breathe
underwater.

--riverman

Waders - Thanks everybody
 

On Sun, 11 Jul 2004, riverman wrote:

Well, since the key is osmotic pressure,

Myron, I was agreeing with you. Hence the winking smiley ;)
__________________________________________________ _____________________
\ Mu Young Lee
remove all dashes and underscores in reply address

Waders - Thanks everybody
 

"riverman" wrote in
:


Well, since the key is osmotic pressure, somehow we have to make the
partial pressure of the water vapor inside the waders higher than the
PP of the water vapor in the river, which is approaching 100%.

The key is not osmotic pressure, which has to do with the concentration of
solutes in the water. It's vapor pressure-- and you're right-- breathables
can't breathe underwater.

Scott

Waders - Thanks everybody
 

"Scott Seidman" wrote in message
. 1.4...
"riverman" wrote in
:


Well, since the key is osmotic pressure, somehow we have to make the
partial pressure of the water vapor inside the waders higher than the
PP of the water vapor in the river, which is approaching 100%.

The key is not osmotic pressure, which has to do with the concentration of
solutes in the water. It's vapor pressure-- and you're right--
breathables
can't breathe underwater.


I was referring to FRANK's waders.

--riverman

Waders - Thanks everybody
 

"Scott Seidman" wrote in message
. 1.4...
"riverman" wrote in
:


Well, since the key is osmotic pressure, somehow we have to make the
partial pressure of the water vapor inside the waders higher than the
PP of the water vapor in the river, which is approaching 100%.

The key is not osmotic pressure, which has to do with the concentration of
solutes in the water. It's vapor pressure-- and you're right--
breathables
can't breathe underwater.


I was referring to FRANK's waders.

--riverman

Waders - Thanks everybody
 

riverman wrote:
"Scott Seidman" wrote in message
. 1.4...

"riverman" wrote in
:


Well, since the key is osmotic pressure, somehow we have to make the
partial pressure of the water vapor inside the waders higher than the
PP of the water vapor in the river, which is approaching 100%.

The key is not osmotic pressure, which has to do with the concentration of
solutes in the water. It's vapor pressure-- and you're right--

breathables

can't breathe underwater.



I was referring to FRANK's waders.

--riverman

Frank wears waders.....why?

brians, sorry frank ;-)