How deep is 3 Atmospheres??
paul
Is 3 atmospheres 100 feet depth?
Please if you can show me a formula
for figuring out how to find depth with respect
to Atmospheres"
thanks
Paul
doc
Paul,
For sea water:
atm = (fsw/33)+1
where atm = atmospheres
fsw = feet sea water
For fresh water:
atm= (ffw/34)+1
where atm = atmospheres
where ffw = feet fresh water
Regards,
doc
paul wrote in message ...
Scubagator
>Is 3 atmospheres 100 feet depth?
No...66 FSW. Your in 1 ATM at sea level. 99 FSW would be 4 ATM.
>
>Please if you can show me a formula
>for figuring out how to find depth with respect
>to Atmospheres"
Every 33 fet is one Atm...so it's not really hard to figure out.
Sean
brianj...@my-dejanews.com
I don't have the metric numbers, but if you need meters you can convert easily
enough.
The air at the surface of the ocean is one atmosphere. Every 33 feet down you
go in salt water (34 feet fresh water) is an additional atmosphere.
0 feet 1 ATM
33 feet 2 ATM
66 feet 3 ATM
99 feet 4 ATM
132 feet 5 ATM
165 feet 6 ATM and so on.
Most of the hyperbaric chambers I have seen only go to 6 atmospheres, and
although I have gone below 100 feet I really don't feel a need to go that deep
regularly. On occasion I do, but only for special reasons.
Brian
In article <Ozak1.275$lz5.6...@newsgate.direct.ca>,
paul...@ixn.net (paul) wrote:
>
> Is 3 atmospheres 100 feet depth?
>
> Please if you can show me a formula
> for figuring out how to find depth with respect
> to Atmospheres"
>
> thanks
> Paul
>
>
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I.B.T
preasure (in Atmospheres) = 1 + depth(in meters) divided by 10
or
preasure (in Atmospheres) = 1 + depth(in feet) divided by 33
paul <paul...@ixn.net> wrote in article
<Ozak1.275$lz5.6...@newsgate.direct.ca>...
smig...@hotmail.com
>
> Please if you can show me a formula
> for figuring out how to find depth with respect
> to Atmospheres"
>
> thanks
> Paul
>
>
will be happy to answer your question.
At sea level the presure of the atmosphere is 14.7psi or 1 atmosphere (1 atm).
At 33 fsw (feet sea water) it is 2 atm. At 66 fsw it is 3 atm. add 1atm per
33fsw.
So to find depth when given atmospheres use the following formula:
(depth in atmospheres - 1)* 33 = depth in fsw
Bob Crownfield
paul wrote:
>
> Is 3 atmospheres 100 feet depth?
>
> Please if you can show me a formula
> for figuring out how to find depth with respect
> to Atmospheres"
>
> thanks
> Paul
If you remember your course, 1 Atm is at sea level.
Each 33 feet of salt water adds one more Atm.
ATM= 1+ (Depth_in_feet/33)
--
Bob Crownfield: Pilot, Photographer, Diver, Delphi RAD addict
-
Unsolicited commercial email in violation of federal code
will be addressed in court.
Michael Robinson
Paul...you must remember when speaking in terms of atmospheres, we are
already under 1, therefore to figues out depth when given atmospheres
subtract 1 atmosphere and multiply it by 33.
eg: 3 atmospheres = ? feet deep
3-1 =2 atmospheres of water * 33 feet each = 66 feet below the
surface
Hope this helps...
On Wed, 24 Jun 1998 17:20:46 GMT, paul...@ixn.net (paul) wrote:
>Is 3 atmospheres 100 feet depth?
>
>Please if you can show me a formula
>for figuring out how to find depth with respect
>to Atmospheres"
>
>
>thanks
>Paul
>
Michael Robinson ICQ# 8252934
My Personal ICQ World Wider Pager is located at:
http://wwp.mirabilis.com/8252934
Ontario - CANADA
mailto:robi...@niagara.com
scott almburg
paul wrote:
> Is 3 atmospheres 100 feet depth?
>
> Please if you can show me a formula
> for figuring out how to find depth with respect
> to Atmospheres"
>
> thanks
> Paul
Isn't 1 atm approx. 33 feet? So if your at 1 atm at the surface, then :
33 ft = 2 atm
66 ft = 3 atm
99 ft= 4 atm
132ft= 5 atm
paul
A warm thank you to all that replied to my query.
To clarify, I am not a diver.
My brother was in a fire and had severe CO poisoning.
He was apparently put in a hyperbaric chamber at 3 atmospheres for
around 1/2 hour and was saved!!!
I was very curious about this and wished to know "how deep"
3 ATM was and figured that the members of this NG would be able
to answer my question
I was right. Thanks again
Paul Horn
Rtuss
I think some folks are getting ATA and ATM mixed up.
The absolute pressure at 66 fsw = 3 ATA.
The pressure exerted by 66 fsw is 2 ATM plus the atmospheric pressure of 1 ATM
= 3 ATA.
doc
I felt that adding "absolute" was an unnecessary distinction considering the
question and the response as given. Naturally, I should have been more
careful for the other readers in the group. :-)
It does become a necessary distinction when only when an expressed number
such as 4.5 is given without the reader knowing if it is an absolute measure
or not.
doc
Rtuss wrote in message <199806250221...@ladder03.news.aol.com>...
Kepytan
I know that there is no such thing as a stupid question as long as a
question is asked so here it goes...
I understand the formulas and all... what does ATA stand for?
doc
ATA= Atmospheres Absolute.
The difference to ATM (Atmospheres) is that for ATA you add one additional
atmosphere (normally 14.7 psi at sea level) for the pressure at the surface.
This pressure is caused by the entire column of air above the surface of the
water.
Regards,
doc
Kepytan wrote in message <6mslet$ont$1...@news-1.news.gte.net>...
Dale Firmin
The usual treatment for CO poisoning is so close to Treatment Table 5
that usually a TT5 is used. The max depth is 60ft and total elapsed
time is 2:15 or 135 mins. Frequent arterial blood gas sampling (ouch)
can release him earlier, as in his case. 60 feet seawater is close
enough to call 3 atms. 60 feet seawater is such a standard depth in
treatment tables that it may have actually been 60 ft.
Dale
Dale Firmin
brianj...@my-dejanews.com wrote:
>
> Most of the hyperbaric chambers I have seen only go to 6 atmospheres,
just for your information...because no US Navy Treatment Table begins
deeper than 165 feet seawater. Saturation chambers will go deeper than
that. TT2A, TT3A, TT4 (air tables), TT6A all begin at 165 feet
seawater. TT1A (air table) begins at 100 feet seawater and is the only
treatment table recommended for in-water treatment, however, it runs for
6:20. All other US Navy Treatment Tables begin at 60 feet seawater.
Surface (chamber) air decompression is always at 20 fsw and 10 fsw.
Surface (chamber) oxygen decompression is always at 40 fsw.
Dale
Giovanni Marola
doc wrote:
>
> ATA= Atmospheres Absolute.
> The difference to ATM (Atmospheres) is that for ATA you add one additional
> atmosphere (normally 14.7 psi at sea level) for the pressure at the surface.
> This pressure is caused by the entire column of air above the surface of the
> water.
>
> Regards,
> doc
Sorry but all definitions of atmosphere as given so far, including the
above, are wrong.
The only right one is:
the pressure exerted at sea level by a column of mercury
760 mm. high at 0 °C.
Giovanni
PS: please throw all that garbage like feet, psi etc in the trash can.
--
Giovanni Marola
Dept. of Information Engineering
University of Pisa
Scuba Page http://marolaws.iet.unipi.it:8001/Isole/Italia2.html
Scubagator
Kick, Kick...yep it's dead...
I don't think Kenny is as dead...
Sean
g.edward...@lmco.com
In article <199806251746...@ladder03.news.aol.com>,
Psst! Sean! I thought I heard a whinny. Better kick
it again.
Oh. It was just one of your polo ponies. Never mind.
Ed
stork
>Please if you can show me a formula
>for figuring out how to find depth with respect
>to Atmospheres"
Depth= (Atmospheres -1)*10 in meters
Depth= (Atmospheres-1)*33 in feet
So 3 Atmospheres -----> 20 meters, 66feet
This is the formula you have to use.
IunbendYou
>The usual treatment for CO poisoning is so close to Treatment Table 5
>that usually a TT5 is used
Depending on where the patient is taken and where the attending physician was
trained TT5 may or may not be used. With the recient bloom of HBO wards in
hospitals and the number of tables currently available it is not uncommon for a
civilian table to be used or even a combinitation of tables in the event of a
difficult case as flow charts from one table into another are now common.
Also stated in a previous post was that most hyprebaric chambers that the
author had seen only go to 6 ATM.... hyperbaric chamber is an ambigious term.
Commerical divers routinely use chambers certified to pressures much greater
than 6 ATM.
John
doc
Glawackus
>From: Giovanni Marola <mar...@iet.unipi.it>
>Date: Thu, Jun 25, 1998 07:5
>Sorry but all definitions of atmosphere as given so far, including the
>above, are wrong.
A *careful* reading of the previous posts will reveal that NO definitions of
"atmosphere" have been given. There have been explanations of what is meant by
certain abbreviations, and there have been correlations between depths and
pressure, and even a nominal value, but no definitions.
ps. Anybody even moderately skilled in information engineering shouldn't be
bothered by simple units like feet and psi.
Steve
The above can be construed as personal opinion in the absence of a reasonable
belief that it was intended as a statement of fact. Or it might just be to
generate discussion.
Glawackus
>From: paul...@ixn.net (paul)
>To clarify, I am not a diver.
>My brother was in a fire and had severe CO poisoning.
There are lots of other causes of CO poisoning, too. Home CO detectors are now
quite cheap, and no home should be without one. The brain you svae may be your
own.
Gordon in Austin
In article <35923A...@iet.unipi.it> Giovanni Marola,
mar...@iet.unipi.it writes:
=> ATA= Atmospheres Absolute.
=> The difference to ATM (Atmospheres) is that for ATA you add one
additional
=> atmosphere (normally 14.7 psi at sea level) for the pressure at the
surface.
=> This pressure is caused by the entire column of air above the surface
of the
=> water.
>Sorry but all definitions of atmosphere as given so far, including the
>above, are wrong.
>The only right one is:
>
>the pressure exerted at sea level by a column of mercury
>760 mm. high at 0 °C.
But all were correct enough to answer the question posted. The guy just
wanted to know how deep he would have to dive to experience the
equivalent pressure his brother was exposed to in a hyperbaric chamber
pressured to three atmospheres.
The answer is (about) 66 feet if the three atmospheres was measured
absolute, and (about) 99 feet if the three atmospheres was measured gauge
(in addition to the one atmosphere we are exposed to at sea level).
Your definition about 760 mm Hg, while technically correct, does not
change the essential answer to the question.
Gordon in Austin
Gordon in Austin
In article <199806251850...@ladder01.news.aol.com> CPR86,
cp...@aol.com writes:
>Don't let the dealers fool you. THEY make a real good mark up on items
>and then claim poverty. Their way of justifying the prices.
Just like every other retail business. If everyone sold everything at
wholesale, there woudn't *be* any retailers.
Gordon in Austin
IRBYJR
If the gage is calibrated to zero in the normal atmosphere, would not gage
pressure only be 66 ft , and absolute pressure be 99 ft, at 3 atmospheres?
Absolute means ALL the pressure, and is defined as gage plus atmospheric (as I
remember my engineering and physics).
.
David Gilder
I think there is some confusion between ats absolute and ats
gauge.
ATS absolute is 20 m
ATS gauge is 30 m
For the psi world 1 ata is 14.7 psi for every 1 ft that you
descend you increase body pressure by .5 lb approx
David
Scubagator wrote in message
<199806241738...@ladder01.news.aol.com>...
>>Is 3 atmospheres 100 feet depth?
>
>No...66 FSW. Your in 1 ATM at sea level. 99 FSW would be 4 ATM.
>>
>>Please if you can show me a formula
>>for figuring out how to find depth with respect
>>to Atmospheres"
>
Jose Carrion Jr
every 33' is 1 atmosphere.
so at 100' you would be at 4 atmospheres
but at 99' you are at 3 atnospheres.
OK? ok!
JoeGuy28
Jose Carrion Jr
at 1' to 33' is one atm
at 34' to 66' is two atm
at 67' to 99' is three atm
so on and so on
JoeGuy28
FSalterjr
Are we talking about absolute atm or atm of water pressure? Total pressure is
in absolute. So if you wanted to have 3 atm of absolute pressure, or total
pressure, on the body, you would have to be at 66' of depth in salt water.
Fred
Steve Gruelle
In article 2...@newsd-173.iap.bryant.webtv.net, JoeG...@webtv.net (Jose Carrion Jr) writes:
>at 1' to 33' is one atm
>at 34' to 66' is two atm
>at 67' to 99' is three atm
>so on and so on
>
Every answer I have seen so far has forgotten the 1 atm of "air" that you
are (likely) starting with, so...
33' is two atm
66' is three atm
.
.
.
Using saltwater values.
---
Steve Gruelle steve....@Corp.Sun.COM
Doug Taylor
In article <12166-35...@newsd-173.iap.bryant.webtv.net>, Jose
Carrion Jr <JoeG...@webtv.net> writes
Not OK :-(
Pressure varies linearly with depth.
If your ambient pressure at 100' is 4 ATA, then at 99' it would be just
1/33 atmosphere less and so on.
Safe diving,
--
Doug Taylor mailto:do...@ivydene1.demon.co.uk
http://www.ivydene1.demon.co.uk/scuba.htm
Sub-Aqua Association UK - 'The Friendliest Divers in the World'
Anttila Matti
> Using saltwater values.
> ---
> Steve Gruelle steve....@Corp.Sun.COM
ATA and ATM are _not_ the same thing! If you want to calculate with
absolute values, then take ATA (=atmospheres absolute), if not, then
take ATM (=atmospheres).
So in 33' sea water (damn I hate these imperial non-SI units ;-) )
which is _about_ 10 meters (10,06m) the pressure is 1 ATM or 2 ATA.
In fresh water the absolute pressure is 2 bars and the pressure of
water 1 bar (0,97 ATM & 1,94 ATA).
Matti
FSalterjr
The original post wanted to know about the pressure on someone in the chamber
at 3 ATM. Any accurate pressure reading, particularly when dealing with
decompression, must be in absolute. I don't think the original poster realized
this.
Fred
TInherst
HARP...@bcn.servicom.es
sea level is 1 atm, and for each 10 meters add 1 atm, thus 50 meters is 6 atm.
go metric
MP
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Glawackus
>at 1' to 33' is one atm
>at 34' to 66' is two atm
>at 67' to 99' is three atm
>so on and so on
>
>
You seem to be confused but persistent. Each 33' of seawater adds 1 ATM (that
is, about 14.7psi) to the pressure exerted by the atmosphere at the water's
surface. You don't magically add 1 ATM in the foot between 33 and 34', nor do
you NOT add pressure from 34 to 66'. Each foot of seawater adds approximately
0.45 psi. The absolute pressure at 34' is about 2.03ATA, and at 66' it is about
3.0