Re: [PSUBS-MAILIST] Energy within gas

["Steven Mills" <barycenter@earthlink.net>]

Hello Ian,

My physics is a bit rusty, too.
Maybe these site references will be of help.


http://microimg.com/science/energy-work_equiv.html
http://microimg.com/science/pressure_equiv.html
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html
http://www-rohan.sdsu.edu/course/ens306/public_html/section1/Pressure_files/
frame.htm
http://www.pitt.edu/~dwilley/hdatltwmenu.html


Unfortunately, I'm in the middle of a Probate process and audit
for my Mother's estate. I'm missing out in a lot of good discussions
and topics here including yours.  The best I am able to do is
collect data and follow the discussion threads for future reference.

--Steve



From: Ian Roxborough <irox@ix.netcom.com>
Sent: Wednesday, May 08, 2002 11:17 PM
Subject: Re: [PSUBS-MAILIST] Energy within gas


> Hi,
>
> Since nobody else has answered I'll have a shot.
> Be warned, my physics hasn't been used for
> a couple of year and is rusty...
>
> Pressure = Energy / Volume
>
> Energy = Pressure * Volume
>
>   3000psi * 6900 = 20700000 Pascals
>   10 liters = 0.010m3
>
>   E = 20700000 * 0.010
>     = 207000 Joules
>
> If we want to estimate the power this would provide
>
>   Power = Energy / Time
>
> So if we use up the energy over, say, 15 minutes
>
>   Power = 207000 / 15 * 60
>
>         = 230 Watts
>   or slightly under a third of a horse power.
>
> These calculations (if remotely correct) probably only
> apply in outerspace where the pressure difference been
> the tank and exhaust is really 3000psi, but if you where
> 1000 feet under the ocean the tank and exhaust pressure
> difference would be only 2550psi.
>
> Compressed air doesn't seem to be a useful way
> of transporting energy in a sub.
>
> Ian.
>