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Blowing up a balloon inside a bottle is difficult if there is no place for the air to be displaced. Once a balloon is blown up inside the bottle, the balloon remains blown up even with the mouth of the balloon wide open. The project in this chapter is presented as a handy way to recycle a few soda bottles or juice containers and at the same time investigate air pressure and fluids displacement. This demonstration can be used for elementary students if they have a basis of understanding for some simple concepts about matter.
Great simple demo for air pressure. This can be duplicated easily and given to the class to determine "What is going on?" Have students draw a model as a pre-activity, work with the phenomena, and then draw a model as a post-activity. What a great way to measure growth.
Susan German (Hallsville, MO)
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