This lesson takes pupils beyond calculations and into the real‑world applications of density. Students explore why enormous ships float while tiny stones sink, how hot air balloons rise, why ice behaves unusually compared to other solids, and how density drives major processes in our weather and oceans.
Clear modelling, diagrams and case‑study examples help pupils connect scientific ideas to engineering, climate and everyday life.

What Students Will Learn
How density explains floating and sinking in surprising situations

Why hot air balloons rise and how heating air changes its density

Why ice is less dense than liquid water, and why this matters for life on Earth

How density differences create currents in oceans and the atmosphere

Some visuals in this resource were made with AI to help bring ideas to life and support student understanding.