Relate air and air movement to weather. Prepare the 15 hurricane machines before school begins. Each is made by filling one bottle with water, then connecting two pop bottles with connectors provided. You will use these 16 machines all day long. Introduce the concept of density.
Density is how close together the molecules of a substance are.
Water is 773 times more dense than air. This means that in a certain amount of space there is one air molecule. In that same amount of space, there are 773 water molecules. Compare the density of objects to the density of population. For example, consider an area in Salt Lake City and an area in Moab.