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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.

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

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

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

In this activity, learners add food coloring to hot and cold water in order to see how fluids at different temperatures move around in convection currents.