Re: Diffusion

I was just reading a limnology book at the lib yesterday and for a gas in
solution (the example used O2) to diffuse 10m in a lake that was otherwise
undisturbed takes about 600 YEARS.  So forget this mm per day stuff.  Their
point was that diffusion is VERY SLOW.  OTOH, if you have even Malaysian snails
in your substrate, you will have more than just diffusion going for you.

Dave Gomberg, Experimenta      San Francisco CA USA   gomberg at wcf_com