Explain that collisions of gas particles with container walls exert a force on the walls.

Explain that collisions of gas particles with container walls exert a force on the walls. Practical lens: Link apparatus, readings, and uncertainty to the exact measurement named in the objective. In Particle motion in gases, this means gas pressure comes from particle collisions with container walls. The answer should use the approved wording from Particle model and pressure, include collision, container, wall, force, and avoid drifting into another section of Particle model of matter. For revision, practise saying the exact objective aloud, then add the one calculation, particle movement, collision, graph, or practical detail that makes the statement true. A strong exam response for checkpoint 67 is specific to explain that collisions of gas particles with container walls exert a force on the walls and does not reuse a generic explanation from a neighbouring objective.