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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.
Center of Science and Industry
Cosi Columbus: Can You Stand the Pressure
Science experiment that demonstrates the four states or phases of matter: solid, liquid, gas, and plasma. Includes full list of materials, procedures, and scientific explanation of how you change water from a liquid state to a gaseous...
Other
Easy Science Experiments: The Incredible Can Crusher
Can you crush a soda pop can with your bare hands? Try this experiment where with the help of air pressure you can show your friends what kind of strength you have. Make sure you stay safe! There is a video included.
Science Bob Pflugfelder
Science Bob: Oobleck: The Cornstarch and Water Experiment
Try this fun and easy experiment to learn about "Non-Newtonian" liquids.
University Corporation for Atmospheric Research
Ucar: Clouds in the Air: Why Are They There?
An experiment that demonstrates why there are clouds in the sky. Start with air, invisible water vapor, particles we call condensation nuclei, and air pressure...the cloud comes later!