Lesson Plan

• Describe how gas pressure arises from particle collisions with surfaces.
• Explain how temperature, volume, and amount of gas affect pressure using the particle model.
• Apply the relationships P = F/A, Boyle’s, Charles’s, and Gay‑Lussac’s laws to predict pressure changes.
• Calculate qualitatively the effect of heating, compressing, or adding gas on pressure.
• Interpret diagrams of particle motion to illustrate forces on container walls.

• Projector and screen for slides/diagrams
• Whiteboard and markers
• Printed worksheet with pressure calculations and diagram labeling
• Syringes or sealed containers for a compression demonstration
• Calculators for students
• Ruler or measuring tape (optional for volume activities)

Ask students to imagine inflating a balloon and feeling the outward push on their hand. Recall that they already know temperature influences kinetic energy of particles. State that by the end of the lesson they will be able to explain pressure as a force per unit area and predict how changes in temperature, volume, or amount of gas modify that pressure.

1. Do‑now (5') – Quick quiz on kinetic energy and temperature concepts.
2. Mini‑lecture (10') – Introduce the particle model, define pressure (P = F/A) and show a schematic diagram.
3. Guided demonstration (10') – Compress a syringe to illustrate pressure increase; discuss observations in terms of collision frequency.
4. Group activity (12') – Students work on worksheet problems applying Boyle’s and Gay‑Lussac’s laws to calculate pressure changes.
5. Concept check (8') – Exit‑ticket question: predict the pressure change when heating a sealed container.
6. Recap (5') – Summarise key relationships and answer any remaining questions.

Review how particle collisions generate pressure and how temperature, volume, and amount of gas influence those collisions. Collect exit tickets to gauge understanding, and assign the remaining worksheet problems as homework for further practice with the ideal‑gas equation.