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In this activity, learners discuss the different salinities of oceans, rivers and estuaries.

In this demonstration, learners observe the effects of density and pressure. A "diver" constructed out of a piece of straw and Blu-Tack will bob inside a bottle filled with water.

In this activity, learners are challenged to design a planktonic organism that will neither float like a cork nor sink like a stone.

In this physics activity, learners will explore buoyancy.

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

In this activity, learners explore the concept of density-driven currents (thermohaline circulation) and how these currents are affected by climate change.