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In this activity and/or demonstration, learners illustrate visually and physically that air has weight. Learners balance two equally-inflated balloons hanging from string on a yard stick.

1 cent - $1 per group Ages 8 - 18 5 to 10 minutes
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Learners cover a bottle with a balloon. When they immerse the bottle in warm water, the balloon inflates. When they immerse the bottle in a bowl of ice, the balloon deflates.

1 cent - $1 per group Ages 8 - 14 5 to 10 minutes
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In this experiment, learners use a blow dryer and water bottle to observe and record changes in air pressure caused by changes in temperature.

$5 - $10 per group Ages 8 - 14 5 to 10 minutes
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In this quick and easy activity and/or demonstration, learners use two empty soda cans to illustrate Bernoulli's principle.

free Ages 6 - 18 5 to 10 minutes
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In this activity, learners explore how air warms when it condenses water vapor or makes clouds.

1 cent - $1 per student Ages 8 - 18 5 to 10 minutes
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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.

free Ages 6 - 18 5 to 10 minutes
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In this demonstration, learners observe vinegar and baking soda creating carbon dioxide (CO2) in a bottle. The gas is poured out of a bottle onto a candle flame, putting out the candle.

1 cent - $1 per group Ages 8 - 14 5 to 10 minutes
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Learners blow into balloons and collect their breath--carbon dioxide gas (CO2). They then blow the CO2 from the balloon into a solution of acid-base indicator.

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

1 cent - $1 per group Ages 6 - 14 5 to 10 minutes
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In this demonstration, learners observe vinegar and baking soda reacting to form carbon dioxide (CO2) gas.

1 cent - $1 per group Ages 8 - 14 5 to 10 minutes
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In this demonstration, learners compare and contrast regular water ice to dry ice (frozen carbon dioxide). Both samples are placed in a solution of acid-base indicator.

$1 - $5 per group Ages 8 - 14 5 to 10 minutes
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In this weather activity which requires adult supervision, learners will get a chance to make a cloud right here on Earth!

1 cent - $1 per student Ages 8 - 14 5 to 10 minutes
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In this activity, learners examine raindrop bottles (prepared ahead of time) to observe in slow motion the behavior of falling droplets and explore concepts such as drag and terminal velocity.

1 cent - $1 per student Ages 8 - 14 5 to 10 minutes
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In this activity, learners discover how to determine the distance to a lightning strike or nearby thunderstorm.

free Ages 6 - 14 5 to 10 minutes
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In this weather activity/demonstration, learners watch as a ping pong ball is suspended in a stream of air supplied by a hair dryer.

free Ages 6 - 14 5 to 10 minutes
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In this demonstration, learners can observe a number of small convection cells generated from a mixture of aluminum powder and silicon oil on a hot plate.

$5 - $10 per student Ages 8 - 14 5 to 10 minutes
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In this online Flash game, learners will captain a sailing challenge, adjusting boat direction and sails, seeking the way to take greatest advantage of varying wind speeds and directions to catch the

free Ages 6 - 14 5 to 10 minutes
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In this activity, learners explore clouds and how they form.

$1 - $5 per group Ages 8 - 18 5 to 10 minutes
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In "Exploring the Solar System: Stomp Rockets," participants learn about how some rockets carry science tools—not scientists—into space, and how a special kind of rocket called "sounding rockets" can

1 cent - $1 per student Ages 6 - 14 5 to 10 minutes
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This activity models the way Landsat satellites use a thermal infrared sensor to measure land surface temperatures.

Over $20 per group Ages 4 - adult 5 to 10 minutes