What effect does decreasing the volume of a gas at constant temperature have on its pressure (Particle motion in gases)

The correct answer is It increases the pressure..

Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: What effect does decreasing the volume of a gas at constant temperature have on its pressure (Particle motion in gases). The correct response is It increases the pressure., because gas pressure comes from particle collisions with container walls. In Particle motion in gases, the marking point should connect directly to explain that faster gas particles collide more often and with greater force. 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 489 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.