What describes the motion of gas particles?

The correct answer is Gas particles move in constant random motion..

Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: What describes the motion of gas particles. The correct response is Gas particles move in constant random motion., because gas pressure comes from particle collisions with container walls. In Particle motion in gases, the marking point should connect directly to describe gas particles as moving in constant random motion. 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 453 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.