Other
South Carolina University: Effusion and Diffusion
Graphic from a slide show shows the concept of effusion nicely. Definitions included.
Frostburg State University
Frostburg State Chemistry Online: Pressure & Oxygen Solubility
The effect of changing pressure on the solubility of oxygen in water. Explains how temperature and pressure affect dissolved oxygen levels. Includes example formulas.
Other
Applied Thermodynamics: Entropy
Entropy is defined and discussed at this site from Applied Thermodynamics. The equation for this mathematical quantity is given and explained. Some unit information concerning entropy is provided.