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In this activity, learners build a hot air balloon using just a few sheets of tissue paper and a hair dryer.

In this chemistry activity, learners use spaghetti to explore density and chemical reactions.

In this quick and easy activity and/or demonstration, learners illustrate the effect of the weight of air over our heads.

Learners assemble a hot-air balloon from tissue paper. The heated air (from a heat gun) inside the balloon is less dense than the surrounding air and causes the balloon to float.

Focus sound through a balloon! In this Exploratorium activity, you'll use dry ice to create a balloon that's a sound lens.

In this hands-on activity, learners make the world's simplest Cartesian diver, using only a plastic bottle, some water, and a condiment packet.

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.

This is a highly visual demonstration that illustrates both the effects of density and chemical reactions.

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.