Browsing various fish keeping web sites and forums, including this one, I keep seeing people saying that surface agitation provides more dissolved oxygen than an air stone does. To me, this seems like a basic science fail, and is more like lore that people see and keep repeating without thinking about it.
If you consider that the surface area of a sphere is 4*Pi*R2 then a 1cm bubble adds 3.14 cm2. Multiply that by the number of bubbles and you soon start to see the huge amount of extra surface area bubbles add for gas exchange. Have a play with this surface area calculator and see what you think.
Yet fish keepers have no issues with getting as many bubbles as possible when using CO2 for planted aquariums. In this context, suddenly getting as many bubbles as possible is good as you get more dissolved CO2. So why is this different to getting oxygen via bubbles?
I did a quick search on this, and the best description I found to back my opinion was this guy's page. There were tons of sites saying the opposite, but none with any explanation, just statements with no reasoning provided.
What do you guys think, am I missing something and full of it? Feel free to show me the error of my ways. My ultimate fantasy is this will be the start of a groundswell of Interweb discussion that will rise up and slay this myth once and for all!