The activitites establish the concepts of atmospheric pressure, differences in pressure, how changing volume affects pressure, and a molecular model of how air pressure arises. Modified from the 5th grade FOSS Water Planet Investigation"The Pressure is On" (Investigation 4, part 3). The lesson opens with some demonstrations and activities to introduce the properties of air. Moving on to air pressure, the teacher demonstrates how one can pick up liquid in a straw using a finger as a stopper. The students make a barometer, experiment with a bag and a jar, and participate in a straw race. For each activity the question of what is causing each phenomenon is asked. Students then do single and double syringe activity from FOSS Water Planet Investigation#4. After discussion of syringe activities students are asked to go back to initial demonstrations/activities and pick one to explain in a poster format.

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