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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 conduct four simple experiments to demonstrate the effects of air pressure.

1 cent - $1 per student Ages 11 - 14 30 to 45 minutes