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Learners see that a carrot slice sinks in fresh water and floats in saltwater.

Learners act as engineers and design mini submarines that move in the water like real submarines.

What keeps bubbles and other things, like airplanes, floating or flying in the air?

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 experiment with surface tension using everyday household items such as strawberry baskets, paperclips, liquid dish soap, and pepper.

In this quick activity (page 1 of the PDF under SciGirls Activity: California Fish), learners will build a simple Cartesian Diver in an empty 2-liter bottle.

In this activity, learners add different liquids to water and apply their working definition of “dissolving” to their observations.

In this activity, learners will make predictions and experiment with different objects to see if they sink or float.