Re: [PSUBS-MAILIST] Alternative hull material.

[SFreihof@aol.com]

If you want to complicate things, you can talk about psig (gauge pressure) vs. psia (absolute pressure), but the only difference is that at sea level, psig=0 when psia = 14.7; So psia = psig + 14.7, regardless of depth.

But why complicate things?  For approximates, you can just figure 1/2 psi per foot of depth... so 8 feet depth is about 4 psi above sea level pressure.

And just for clarity, psi = pounds per square inch.




In a message dated 3/18/2003 7:16:02 PM Eastern Standard Time, Warren Greenway <opensourcesub@yahoo.com> writes:

>14.7 is what's in my charts.
>
>Warren.
>
>--- peter  mckellar <mckellar@earthlink.net> wrote:
>> Hi Ward,
>> 
>> >Please correct me if I'm wrong, but isn't 33 feet 1
>> atmosphere?  The
>> pressure at 8 feet is almost trivial. 
>> 
>> 0'  = 1 ATM
>> 1 ATM = 14.7 psi
>> 33' = 2 ATM (2 ATM is actually 32.8')
>> 8'  = 2.5m
>>     = 1.25 ATM
>>     = 18.4 psi (true, pretty trivial)
>> 
>> i've rounded a little in the sums :)
>> 
>> 14.7 psi seems higher than my faded pre-metric
>> memories suggest.  can anyone confirm this is
>> correct?
>> 
>> the conversions were done by:
>> 
>>   http://www.megaconverter.com/Mega2/
>> 
>> 
>> hope this helps
>> peter
>
>
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