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

Re: [APD] To pearl or not to pearl...

On Fri, 18 Mar 2005 11:37:01 -0500, Robert Zink <bonsai at hrcreditunion_net> wrote:

Hi Liz,

You wrote:

On Thu, 17 Mar 2005 13:14:08 -0600, Douglas Guynn <d_guynn at sbcglobal.net>
I've been through this discussion before and no one could explain to me
where the gasses for super-saturation come from.

Lots of places. The water coming out of the tap is at a pressure higher than room pressure. Outgassing can occur when the pressure drops because the solubility of the gas also drops.

So if I'm seeing bubble production dependant on plant species and the amount of light, do you think that is an out-gassing event?

Fill a 10 gallon, smooth sided container with water using the same
method you use to fill your aquarium.  Drop a piece of rough wood in,
keep the temperature the same as your aquarium and look to see if the
wood gets bubbles on it.  That's outgassing.  If the wood doesn't get
bubbles on it you can be pretty certain the bubbles are pearling.

Why a piece of rough wood? Why a smooth sided container? Also, how can one be sure the bubbles on the wood are not gasses from within the wood itself that have been displaced and driven out by the water?

Presumably the idea is to concentrate the bubbles on the rough wood, as bubbles will occur more on rough surfaces. When I fill up a tank with water, it becomes absolutely covered in bubble on every surface. You can see lines in the bubbles on the glass where filling was faster or slower...

Andrew McLeod
thefish at theabyssalplain_freeserve.co.uk

This email was scanned carefully before transmission to remove any content, information or relevance.
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com