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    NOAA
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    In this quick and easy activity and/or demonstration, learners use two empty 2-liter bottles and hot tap water to illustrate the effect of heat on pressure. Learners will be surprised to see what...

    free Ages 6 - 18 5 to 10 minutes
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    Institute of Physics
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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. This...

    1 cent - $1 per group Ages 4 - adult Under 5 minutes

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