Re: [PSUBS-MAILIST] Equasion Query

["Pierre Poulin" <pipo305@hotmail.com>]

Pressure is weight by a certain surface. To determine the pressure, just 
imagine that you lift a colon of water of 1 inch X 1 inch X total deep you 
want. This is the pressure in PSI (pound X square inch (inch X inch))

Water is compressable, but it require a lot of pressure. Not in the range 
that we are dive with a psub.

So the formula is 0.0361 X 12 X deep (in foot).

Pierre






>From: Coalbunny <coalbunny@vcn.com>
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Equasion Query
>Date: Tue, 04 Feb 2003 13:06:14 -0700
>
>If you don't mind, I have a simple question-
>You say that water is not compressable.  Ok, but at 5,000 meters depth,
>the pressure is intense, right?  Right.  So would one cubic foot of
>water at 5,000 meters have the same quantity (in liters or gallons) as
>one cubic foot at sea level?  I would presume it would.  Like having a
>helium balloon at sea level, take it to 5,000 meters above sea level and
>it increases in size.  See what I mean?  And what is the formula for
>deciding the pressure at a given depth?
>Carl
>
>
>Pierre Poulin wrote:
> >
> > Jasper,
> >
> > We can say that water is not compressible. Your sub shouldn't too. So 
>the
> > displacement is the same at whatever deep.
> >
> > What you are talking about is an ambient pressure sub: pressure outside 
>=
> > pressure inside. Whatever the design, exept wet sub (fill of water)the
> > displacement/bouyency remain the same.
> >
> > Pierre
> >
> > P.S. Don't hesitate to pose questions, it's the purpose of this group!
> > P.P.S. please, present yourself to the group!
> >
> > >thanks again pierre, one more question if i might. does this equasion 
>hold
> > >up
> > >even if at 100' depth that the internal air pressure is increased to 
>the
> > >same
> > >exterior pressure (ie 3 atmospheres)?
> > >
> > >jasper
> >
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>--
>"You delight not in a city's seven or seventy wonders, but in an answer
>it gives to a question of yours, or the question it asks you, forcing
>you to answer, like Thebes through the mouth of the Sphinx." -- Kublai
>Khan


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