RE: [PSUBS-MAILIST] Equations Query

["Roger June" <rjune@fuse.net>]

This is an easy one

IN ENGLISH UNITS
At sea level you have 1atm (Atmosphere) or 14.69595psi (pounds per square
inch) exerting force on everything, this is from the air.  As you go down in
depth the pressure increases at a rate of 14.69595psi for every 32.8083
feet.  So if you are at 32.8083 feet below the water than the pressure is
29.3919psi (14.69595psi for the 32.8083 feet + 14.69595 from the original
air pressure.)

So if your at 16404.15 feet under water , what is the pressure?

   16404.15 feet / 32.8083 feet = 500
   500 x 14.69595psi = 7347.975psi
   7347.975psi + 14.69595psi (from the original 1atm) = 7362.67095psi
   answer = 7362.67095psi


IN METRIC UNITS
At sea level you have 1atm (Atmosphere), or 10332.27 kilograms/meter^2
exerting force on everything, this is from the air.  As you go down in depth
the pressure increases at a rate of 1atm for every 10 meters.  So if you are
at 10 meters below the water than the pressure is 20664.54 kilograms/meter^2
(10332.27 kilograms/meter^2 for the 10 meters + 10332.27 kilograms/meter^2
from the original air pressure.)

So if your at 5,000 meters under water , what is the pressure?

   5,000 meters / 10 meters = 500
   500 x 10332.27 kilograms/meter^2 = 5166135 kilograms/meter^2
   5166135 kilograms/meter^2 + 10332.27 kilograms/meter^2 (from the original
1atm) = 5176467.27 kilograms/meter^2
   answer = 5176467.27 kilograms/meter^2

Roger June
REJ and Company
4307 Delridge Rd
Cincinnati, Ohio 45205
Phone and Fax 513-251-8880
rej.co@fuse.net


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> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Coalbunny
> Sent: Tuesday, February 04, 2003 15:06
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Equasion Query
>
>
> 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
> >
> > _________________________________________________________________
> > MSN Messenger : discutez en direct avec vos amis !
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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
>