Lee
A question- As Water is H2O - would not the gas molecules compress- as
Air does as depth increases ?

Ken

Lee B ell wrote:
> Lee Bell, CID
> ----- Original Message -----
> From: "Bjorn Vang Jensen" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, August 19, 2003 5:46 AM
> Subject: Re: [SCUBA-SE] explosion theories ?
>
>
>
>>Lee wrote:
>>
>>
>>>Being non compressable, the density of the water would be the same
>>>regardless of depth and, therefore, the speed of transmission would be as
>>>well.  Sonar, fish finders, for example, kind of depend on this.
>>
>>Not correct. The density of water varies with pressure, salinity and
>>temperature.
>
>
> It is correct.  The density of water does not vary with pressure, which is
> the only issue I've addressed.  Don't believe it, take a glass jar down on
> your next deep dive, the thinner the better.  Put the top on and head for
> the surface.  If it's intact when you get there, the water was no denser at
> depth than it is at the surface, even though the pressure is very different.
> If you figure that the problem is that you can't get it deep enough, fill
> the bottle completely with water, tie it on a fishing line and lower it to
> the deepest spot you can find.  If it's not broken when you reel it back up,
> the density of the water in it didn't decrease.  This is exactly why we
> worry about the gas in our tissues and lungs during an ascent and not the
> liquid.
>
> The density of water does change with salinity, but that's not a function of
> pressure, it's a function of material added to the water.  Different issue,
> different answer.  The density changes with anything suspended or dissolved
> in water.  I'm sure you realize that the effectiveness of sonar also varies
> depending on salinity and/or particles suspended in the water.
>
> I'm not as positive about temperature, but I'll go out on a limb, just for
> the sake of argument.  As long as water is in its liquid form, the density
> doesn't change with temperature either.  I'm willing to bet that a sealed
> glass jar, completely filled with water and sealed at room temperature, will
> not break if placed in a pot of boiling water.  Want to bet the cost of a
> bottle of your favorite brew against a bottle of mine?  I'd like to keep it
> friendly and can't think of a better way.
>
> Lee
>


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