Vision Learning
Visionlearning: Atmosphere and Oceans: Composition of Earth's Atmosphere
An explanation of the different parts of the atmosphere and how pressure and temperature changes at different altitudes.
Other
Chemical Reax/exothermic Reactions
A wonderfully complete primer on exothermic reactions in the context of chemical spills. Covers Reactions with Air or Water, Combustible Organics, Polymerization Reax, Decomposition, Corrosion, and much much more.
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.
Sophia Learning
Sophia: Bill Nye Demonstration: Crushing a Can With Air
Discover the effects of water vapor, the form water takes on as a gas, when it undergoes changes in atmospheric pressure as Bill Nye the Science Guy provides a demonstration of the compound water.