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    Institute of Physics
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    In this demonstration, learners observe the effects of air pressure. They will watch as marshmallows inside a bottle expand as a vacuum pump removes air from the bottle. The marshmallows will...

    $1 - $5 per group Ages 4 - adult Under 5 minutes
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    The Exploratorium
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    In this activity, learners create a tornado in a bottle to observe a spiraling, funnel-shaped vortex. A simple connector device allows water to drain from a 2-liter bottle into a second bottle....

    $1 - $5 per student Ages 4 - 14 10 to 30 minutes