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Cartesian Diver

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In this demonstration, learners observe the effects of density and pressure. A "diver" constructed out of a piece of straw and Blu-Tack will bob inside a bottle filled with water.
1 cent - $1 per group Ages 4 - adult Under 5 minutes

Test Your Lung Power

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In this activity, learners try to blow up a balloon hanging inside of an empty bottle.
1 cent - $1 per student Ages 6 - 14 Under 5 minutes