Professor of Geography Michael Ritter, from University of Wisconsin, Stevens Point, provides another excellent online textbook for high-school and college students.
This illustrated chapter on atmospheric pressure for high school and college students is from the online textbook "Fundamentals of Physical Geography" by Michael Pidwirny, Associate Professor, University of British Columbia.
Today's lesson from the National Weather Service Online Weather School is all about air pressure, and this online classroom includes six do-it-yourself experiments or labs, called Learning Lessons.
In addition to the short lesson, this NASA Kids Earth site includes three air pressure experiments, a word search puzzle, five discussion questions ("What do you think causes wind?") and a couple of online experiments
This illustrated geology lesson for elementary and middle-school students includes songs ("Why Does the Wind Blow") and an introduction to atmospheric pressure, density, wind patterns, and the Coriolis effect.
Air pressure is the weight (or force) of the atmosphere at any particular point. Although you can't feel it or see it, air pressure plays an important part in weather, and can be demonstrated with some really fun experiments.