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

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.

In this activity, learners build a speedboat using paint paddles, a propeller, and film canister. Learners attach a simple circuit and motor to the boat to power the propellers.

In this activity, learners prepare four polymer elastomers and then compare their physical properties, such as texture, color, volume, density, and bounce height.

In this activity, learners build styrofoam boats powered by twisted rubber bands.

Learners observe working lava lamps to understand how they work (included in PDF link).

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