What is the relationship between gas pressure and volume at constant temperature (Particle motion in gases)

The correct answer is Pressure decreases as volume increases.

Particle lens: Describe arrangement, motion, spacing, collisions, or energy changes only when they are relevant here. This question asks: What is the relationship between gas pressure and volume at constant temperature (Particle motion in gases). The correct response is Pressure decreases as volume increases, because gas pressure comes from particle collisions with container walls. In Particle motion in gases, the marking point should connect directly to explain that collisions of gas particles with container walls exert a force on the 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 468 is distinct because it uses this exact question context and the particle lens rather than a generic particle-model sentence.