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    Colorado State University
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    This demonstration/activity helps learners understand why higher elevations are not always warm simply because "hot air rises." Learners use a tire pump to increase the pressure and...

    $1 - $5 per group Ages 8 - 18 10 to 30 minutes
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    Colorado State University
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    In this activity, learners use cheap, thin plastic garbage bags to quickly build a solar hot air balloon. In doing so, learners will explore why hot air rises. Learners can use a hair dryer to...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    Children's Museum Of Houston
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    In this activity, learners create a model of a hot air balloon using tissue paper and a hairdryer. Educators can use this activity to introduce learners to density and its role in why things float....

    $5 - $10 per group Ages 6 - 14 1 to 2 hours
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    WGBH
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    In this challenge, learners make a helium balloon hover in one spot and then move it through an obstacle course using air currents. Learners will explore gravity and buoyancy in this simple and...

    $1 - $5 per student Ages 8 - 14 10 to 30 minutes