Interactive
University of Colorado

University of Colorado: Ph Et Interactive Simulations: Fluid Pressure and Flow

For Students 9th - 10th
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.
Activity
Center of Science and Industry

Cosi Columbus: Can You Stand the Pressure

For Students 9th - 10th
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...
Activity
Other

Easy Science Experiments: The Incredible Can Crusher

For Students 9th - 10th
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.
Activity
Science Bob Pflugfelder

Science Bob: Oobleck: The Cornstarch and Water Experiment

For Students 4th - 8th
Try this fun and easy experiment to learn about "Non-Newtonian" liquids.
Lesson Plan
University Corporation for Atmospheric Research

Ucar: Clouds in the Air: Why Are They There?

For Teachers 3rd - 5th
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!