When gas particles collide with the walls of their container, what do they exert (Increasing the pressure of a gas (physics only) (HT only))

The correct answer is A force that exerts gas pressure.

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 (Increasing the pressure of a gas (physics only) (HT only)). The correct response is A force that exerts gas pressure, because gas pressure comes from particle collisions with container walls. In Increasing the pressure of a gas (physics only) (HT only), the marking point should connect directly to (Physics only) (HT only) Use the particle model to explain energy transfer during gas compression. 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 627 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.