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Product Information Demonstrate submarine theory and Archimedes' principle. By drawing the air out of the ball with the cylinder, you create a vacuum. Water enters the ball through the nut in the bottom of the ball causing the ball to sink. Then, by slowly filling the ball with air the water is forced out and the ball will rise. Includes: 3" transparent air ball, 60ml air cylinder, connecting latex hose, instructions.  Tell a Friend about this item
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