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In this activity, learners discover that as the salinity of water increases, the density increases as well. Learners prove this by attempting to float fresh eggs in saltwater and freshwater.

In this activity, learners use tinfoil to build and test their own boats - which designs will float, and which will sink?

In this activity, learners create a model of a hot air balloon using tissue paper and a hairdryer. Educators can use this activity to introduce learners to density and its role in why things float.

In this activity, learners explore what makes a boat float and sink. They examine and test various objects to determine why objects float or sink.

Test the buoyancy of an aluminum foil boat and an aluminum foil ball. Why does the same material in different shapes sink or float?

In this activity, learners explore density and buoyancy as they design and construct rafts.

In this activity, learners build a hovercraft using a paper plate, cup, and simple motor.

Build a pinwheel that works without wind! This activity contains steps on how to build a parachuting pinwheel out of paper, a film canister, and some brads.