Activity
PBS

Pbs Kids: Science Rocks: Air Lift

For Students 3rd - 8th
Through this experiment, students are challenged to lift a book (and other items) with just air. Requires simple household items, gallon-size, zipper-lock plastic bag, book, pencil, drinking straw, and tape.
Activity
Other

Federal Aviation Administration: Air Takes Up Room [Pdf]

For Students 5th - 8th
See how air takes up space by conducting this classroom experiment. With the aid of several common objects, observe the effects of air pressure.
Activity
Scholastic

Scholastic: Dirtmeister's Science Lab: The Air Is There

For Teachers 6th - 8th
An experiment to see how the temperature of an object affects how high it bounces. This site contains web links and notes for the teacher.
Lesson Plan
Science and Mathematics Initiative for Learning Enhancement (SMILE)

Smile: The Properties of Air

For Teachers K - 1st
Lesson plan to teach properties of air. Pupils use balloons, plastic bottles, plastic bags and a meter stick to conclude that air is a gas that has weight, exerts pressure, and moves.