What happens to gas pressure when gas particles collide with the walls of their container?

The correct answer is Gas pressure increases.

Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: What happens to gas pressure when gas particles collide with the walls of their container. The correct response is Gas pressure increases, because gas pressure comes from particle collisions with container walls. In Particle motion in gases, the marking point should connect directly to use the particle model to explain why gas pressure changes when gas particles collide with container walls. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Particle model and pressure, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 498 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.