

A full lesson explaining thermal expansion in solids, liquids, and gases, linking particle theory with real-world applications such as bimetallic strips, thermometers, and expansion joints. Includes diagrams, labelled examples, and misconceptions (e.g., “molecules do not expand”). The slides build conceptual understanding step-by-step, integrating particle-motion explanations and comparative discussion. Concludes with consolidation tasks, everyday examples, and short-answer questions with answers. Encourages students to connect theory to engineering and safety design contexts.
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