Particle models: gas, liquid, solid | 11-14 years

A photograph of 3D particle models illustrating molecules of water

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Help your students develop their understanding of gases, liquids and solids using the particle model in this lesson plan with activities for 11–14 year olds.

In this activity, students think about gases, liquids and solids in terms of the particle model. They interpret diagrams on cards showing representations of particles and may observe a teacher demonstration.

The activity provides an opportunity for students to:

Reinforce their understanding of the terms gas, liquid and solid.
Explore the use of models to describe gases, liquids and solids.

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