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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.
Lava Lamps
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Learners observe working lava lamps to understand how they work (included in PDF link).
Erupting Fizz
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This is a highly visual demonstration that illustrates both the effects of density and chemical reactions.