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    Colorado State University
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    In this activity about phase change and condensation, learners boil water in an empty pop bottle in the microwave. Then, learners stretch a balloon over the mouth of the bottle and will be...

    1 cent - $1 per group Ages 8 - 14 Under 5 minutes
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    Twin Cities Public Television
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    In this quick activity (located on page 2 of the PDF), learners will see the effects of convection and understand what makes hot air balloons rise. Learners will fill a bottle with hot water...

    1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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    Science Museum of Minnesota
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    Experiment with force and pressure by building a balloon rocket. When launched, the balloon will run a track wherever you place the string. All you need is a balloon, clothespin, a straw, some tape...

    1 cent - $1 per student Ages 4 - 11 30 to 45 minutes
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    American Association for the Advancement of Science
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    Learners complete two simple experiments to prove the existence of air and air pressure which surround us. First, they push an inverted cup into water; the air in the cup prevents water from...

    1 cent - $1 per group Ages 8 - 11 5 to 10 minutes
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    NOAA
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    In this quick activity, learners observe how salinity and temperature affect the density of water, to better understand the Great Ocean Conveyor. Learners observe what happens when they add...

    1 cent - $1 per group Ages 6 - 14 5 to 10 minutes
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    Lunar and Planetary Institute
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    In this activity, learners observe the water cycle in action! Water vapor in a tumbler condenses on chilled aluminum foil — producing the liquid form of water familiar to us as rain and dew....

    1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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    Colorado State University
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    The demonstration/experiment provides quick proof that air has mass. Learners measure the mass of a 2-liter bottle attached with special "Fizzkeeper" cap before and after extra air...

    $1 - $5 per group Ages 8 - 14 5 to 10 minutes
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    Colorado State University
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    In this kinesthetic activity that demonstrates pressure, learners act as air molecules in a "container" as defined by a rope. Learners explore how air molecules move in different...

    free Ages 8 - 14 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    Learners observe a flask with a balloon attached over the mouth and inverted inside the flask. This display from The Nature of Matter unit in OMSI's Chemistry Lab has great potential as a...

    $1 - $5 per group Ages 11 - adult 30 to 45 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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