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This is not a shot at you .. this is a legit conjecture..  Isn't the 
reason that the air comes out of the bladder because of the density of 
air relative to the density of water??  Isn't the whole reason that any 
thing that provides bouyancy because it's density is less than the medium 
that the object is contained in??  

matt

On Thu, 9 Jul 1998, Andy Feifarek wrote:

> OK.....   Doesen't air have a tendancy to rise while in water???  I thought
> so..  Hence to empty a bladder doesen't the deflator need to be the highest
> point of that system??  I thought so...
> 
> Try this next time you go diving...  Take a bladder under water.   (make sure
> it isn't the one attached to you)  Fill it fully with air.  Now press the
> deflate button..  it deflates to a certian degree right?  now move the baldder
> around to where the inflator/deflator is at the highest point and prtess the
> deflate button again... WOW more air comes out!!!
> 
> Yes, the outside pressure of the water does deflate the bag...  If the ambient
> pressure of the bladder and the water were the same, the bag would not
> deflate.  Thus water pressure is greater than air pressure
> 
> 
> Andy Schmidt wrote:
> 
> > Dear Jammer Six [mailto:jammer@oz*.ne*]
> >
> > >> Isn't the water pressure then greater than the air pressure inside the
> > wing? Doesn't that force the air out? <<
> >
> > Nope, the wing is a flexible container and the air inside the bladder is
> > compressed (reduced in volume) relative to the current depth - until the
> > pressure inside the bladder is equal to ambient pressure.
> >
> > (Let's forget all this "advanced" "technical" stuff and just concentrate on
> > Boyle's Law from your basic scuba class.)
> >
> > Best Regards
> > Andy
> >
> > EMail:  Andy@Sc*.AS*
> >
> 
> 
> 
> 
> 
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