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.
Exploratorium
Exploratorium: Go With the Flow
This lesson plan is a great way to observe the flow of water. Kids can do this experiment at home by following this easy procedure, complete with pictures.