PPT Slide
Diffusion rate = [c * Area/Distance] [saturation-DO]
The model implies that Oxygen concentration approach equilibrium asymptotically
When [saturation-DO] is large, rates of exchange with the atm are high
When [saturation-DO] is small, rates of exchange are small
The direction of oxygen exchange depends on Henry’s law
- if over-saturated (supersaturated) water will lose oxygen to atmosphere
- if under-saturated, water will gain oxygen from the atmosphere