When gas particles collide with the walls of their container, what do they exert (Particle motion in gases)

The correct answer is A force on the walls..

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: When gas particles collide with the walls of their container, what do they exert (Particle motion in gases). The correct response is A force on the walls., because gas pressure comes from particle collisions with container walls. In Particle motion in gases, the marking point should connect directly to describe how increasing temperature increases the average kinetic energy of gas particles. 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 483 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.