University of Colorado
University of Colorado: Ph Et Interactive Simulations: Fluid Pressure and Flow
Explore pressure in the atmosphere and underwater. Reshape a pipe to see how it changes fluid flow speed. Experiment with a leaky water tower to see how the height and water level determine the water trajectory. Java required.
Science Bob Pflugfelder
Science Bob: Make a Cartesian Diver!
This site presents a procedure for creating a cartesian diver, a miniature submarine which rises or sinks depending upon the water pressure within a closed bottle. The site also introduces basic concepts of water and air pressure.