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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
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In this quick and easy activity and/or demonstration, learners illustrate the effect of the weight of air over our heads.

free Ages 6 - 18 Under 5 minutes