Lesson Plan

• Recall Boyle’s Law and the equation pV = constant for a fixed mass of gas at constant temperature.
• Explain how a change in volume influences pressure when temperature is unchanged.
• Apply p₁V₁ = p₂V₂ to solve numerical problems involving pressure and volume.
• Construct and interpret a pressure‑volume graph, recognising its hyperbolic shape.
• Identify common errors such as unit mismatches and inadvertent temperature changes.

• Projector or interactive whiteboard
• Slide deck covering Boyle’s Law
• Printed worksheet with practice questions and data table
• Graph paper or digital graphing tool
• Sealed syringes/piston apparatus for a demonstration
• Scientific calculators (one per student)

Begin with a quick question about everyday examples of gases being compressed, then ask students to predict what happens to pressure. Review the particle model and remind them that temperature must stay constant for Boyle’s Law. State that by the end of the lesson they will be able to calculate and graph pressure‑volume relationships accurately.

1. Do‑now (5') – Students write the pV relationship on sticky notes and share one real‑world example.
2. Mini‑lecture (10') – Derive Boyle’s Law, introduce pV = k and the rearranged form p₁V₁ = p₂V₂.
3. Demonstration (8') – Use a syringe/piston to vary volume and observe pressure changes; discuss observations.
4. Guided practice (12') – Solve the example (100 kPa, 2 L → 3 L) together and fill in the tabular illustration.
5. Graph activity (10') – Students plot the table data on graph paper or a digital tool, identifying the hyperbola.
6. Independent practice (10') – Worksheet with three practice questions; teacher circulates to address misconceptions.
7. Check for understanding (5') – Exit ticket: one calculation and one short explanation of the graph shape.

Recap that pressure and volume are inversely related at constant temperature and that the product remains constant. Collect the exit tickets to gauge mastery, and assign a short homework task to complete a pressure‑volume table for a new gas sample. Remind students to bring their calculators for the next lesson on temperature effects.