Re: [Killietalk] Nitrogen, nitrate, nitrite and ammonia

[Barry Cooper <bjc3 at centurytel_net>]

Lee,

That's a very useful reference. The point remains, with a power head in 
the tank, the surface layer of water would continually be renewed 
allowing significant diffusion of gases between the atmosphere and the 
water. It is intuitively obvious that the extent of that effect would 
depend on the amount of water movement. Most power heads, even small 
ones, would produce a pretty significant movement at the water surface. 
It would certainly not qualify as an undisturbed system.

Now I'm supposed to be helping with our version of turkey - duck 
actually. It would take us months to finish off a turkey, being just two 
of us here.

Barry

Barry J. Cooper
Sweet Home, OR 97386



LeeH920226 at aol_com wrote:

> In a message dated 11/25/04 3:00:13 PM, bjc3 at centurytel_net writes:
>
> << . That will continually refresh the water at the interface 
> with the atmosphere, that is at the surface, and allow equilibration of 
> gases according to their partial pressures. Turbulence, in the sense of 
> splashing, is not necessary. >>
>
> The rate of exchange at a liquid/gas interface is a function of the velocity 
> of the liquid and the gas at the interface up to the turbulent velocity (as 
> differentiated from laminar flow), At and above the turbulent velocity, the rate 
> is independent of velocity and is the maximum possible. see, for example
> http://www.iup.uni-heidelberg.de/institut/studium/lehre/Uphysik/uphysik2/bound
> ary_layer.pdf
>
> Lee Harper
> Media, PA USA
>
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