1. Density and Air Pressure Demonstrations

2. Demonstration 1 (pg. 7): The air is made up of: 78% Nitrogen 21% Oxygen 1% Other Gases

3. Experiment 2 (pg. 9): The atmosphere is constantly changing, with gases moving in and out of living things, the land, and water

4. Demonstration 3 (pg. 11): Air Has Mass

5. Experiment 4 (pg. 11): Density = mass/volume

6. Demonstration 5 (pg. 11): Air Pressure pushes on objects in all directions. Including up!

7. Experiment 6 (pg. 11): Air pressure increases as density increases

8. Demonstration 7 (not in the book, but a fact you need to know): Air is a Fluid

9. Demonstration 8: Air Pressure increases as temperature increases

10. Demonstration 9: Air molecules expand as temperature increases. As temperature increases density decreases.