This lesson introduces pupils to the concept of density, building directly on their understanding of mass, volume and particle theory from Lesson 1. Students learn how density explains why some materials float, why others sink, and why different liquids can form layers. Clear modelling, visual diagrams and simple demonstrations make this lesson highly accessible for Year 8 learners.
Pupils explore how particle spacing affects density, compare materials using scientific reasoning, and observe how liquids with different densities stack to form a “density column”.
What Students Will Learn
How to define density using mass and volume
Why materials have different densities based on particle spacing
How density determines whether an object floats or sinks
How liquids can form layers due to density differences
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