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Pressure: Mash marshmallows vacuum pack a student and take the suction cup challenge... The goal is to teach the basic concepts of pressure in liquids and gases in an engaging and informative way. Twelve teacher/student demos and ten hands-on activities. Marshmallow Masher - Students compress the air in a container with marshmallows inside and witness the results; Pascal s Pillow - Students learn the power of air pressure when they lift a book using a balloon and their own lungs; Crushing a Can - Demonstration on how to crush a can using air pressure.