[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: CO2 regulators

To: Aquatic-Plants at actwin_com
Subject: Re: CO2 regulators
From: Paul Sears <psears at nrn1_NRCan.gc.ca>
Date: Mon, 2 Oct 2000 14:55:08 -0400 (EDT)
In-Reply-To: <200010011948.PAA04449 at actwin_com> from "Aquatic Plants Digest" at Oct 01, 2000 03:48:02 PM

> From: IDMiamiBob at aol_com
> Subject: Re: CO2 regulators
> 
> Mike Lowry writes:
> 
> > Knocking 900 psig down to
> >  a consistent 10-25 psig is a pretty good trick...can anybody tell me how
> >  much the gas expands when this occurs (just curious)?
> 
> 900 divided by 10 wold be 90 times.  900 divided by 25 would be 36 times.  So 
> it expands to 36-90 times its compressed volume.  Easy, huh? 

	A bit _too_ easy.  The "g" in psig is "gauge" (or some other spelling
in certain parts of the world :)  ).  That means that the pressure is that
much above atmospheric.  The absolute pressure is about 100 kPa higher (15 psi
or so).  The other wrinkle is that CO2 in equilibrium with the liquid is
at a high enough pressure to act as anything but an ideal gas, so the answer
to the calculation will be very approximate.

-- 
Paul Sears        Ottawa, Canada

Prev by Date: Re: CO2 regulators
Next by Date: Re: MTS in DC
Prev by thread: Re: CO2 regulators
Next by thread: Re: Do we need RO?
Index(es):
- Date
- Thread