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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

Erupting Fizz

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This is a highly visual demonstration that illustrates both the effects of density and chemical reactions.
$1 - $5 per group Ages 4 - adult 5 to 10 minutes