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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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Learners measure a bottle full of air, and then use a vacuum pump to remove the air. When they re-weigh the bottle, learners find the mass is about 0.8g less.

Over $20 per student Ages 11 - adult 5 to 10 minutes