that's just the opposite for solids, which dissolve better at higher temps,
but it makes sense on a molecular level.
here's a link that looks like its part of an online course:
http://wow.nrri.umn.edu/wow/under/parameters/oxygen.html
lots equations and stuff.
Geoff Kimber
Lexington,KY
On Sunday 19 January 2003 06:52 pm, Todd Crail wrote:
> That wouldn't suprise me if the temp played the largest role. However, I
> guess my goal is to create as much DO2 as possible at any temp, esp when we
> get up into the 70's and 80's over summer. I have all the equipment, has
> anyone ever done a study on dissolved oxygen, or have references to papers?
> I'm not real sure where to look, but I haven't put any effort forth yet
> either :) I have a DO2 meter, a pH meter, and an ORP meter (oxidation
> redox potential). Lots of things to watch... I can set up a control tank
> in the basement just to play with the heat and whatnot (read: "Oh no
> honey... I'm not putting any fish in there. This is for scientific study,
> I swear!" ;)
>
> Wanna see something real crazy? Not only can O2 be limited indoors, you
> can also increase the amount of CO2 composition in the air as well. Put a
> pH meter on your tank that's in a room where you're entertaining a bunch of
> people. Watch the pH DROP from all the excess CO2 (a weak acid) mixing
> into your gas exchange. Now think about that respiration, and increased
> temp due to body heat, and what a "stuffy room" really is... Wanna make it
> more fun? Turn on a couple of those halogen lights that burn hot too. Oh
> yeah. Pale fish in no time. Might even start gasping. People
> unconsciously begin relocating in the house, or seem very uncomfortable if
> they can't leave. And all this can be avoided by having a nice little line
> outside mixing in atmospheric levels of O2... Well for the fish anyway.
> The people can just go home if they don't like it ;)
>
> And don't sweat it Travis. I enjoyed typing it up. I was awake anyway,
> and blissfully drifted back off into sleep after I'd finished. :)
>
> ----- Original Message -----
> From: "Mark" <markb_at_columbus.rr.com>
> To: <nanfa_at_aquaria.net>
> Sent: Saturday, January 18, 2003 4:09 PM
> Subject: Re: NANFA-- The dissolved oxygen thang
>
> > Wow, I never considered there might be lowered oxygen indoors. I'm kind
>
> of
>
> > surprised it would be that much of a difference. Wonder if the dissolved
> > O2 levels in the tanks has anything to do with the temperature of the
> > induced air. Does cold air dissolve more readily than warm air,
>
> regardless
>
> > of water temperature? Maybe the temperature _difference_ effects the
> > dissolution of the gasses.
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