Describe the effect of increasing the volume of a gas at constant temperature on the pressure exerted by the gas.

Increasing the volume of a gas at constant temperature decreases the pressure exerted by the gas. This occurs because the gas particles have more space to move, resulting in fewer collisions with the container walls.

Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: Describe the effect of increasing the volume of a gas at constant temperature on the pressure exerted by the gas. The correct response is Increasing the volume of a gas at constant temperature decreases the pressure exerted by the gas. This occurs because the gas particles have more space to move, resulting in fewer collisions with the container walls., because density links mass and volume, so the answer must preserve which quantity is being calculated. In Pressure in gases (physics only), the marking point should connect directly to (Physics only) Explain how changing the volume of a fixed mass of gas changes the frequency of particle collisions with container 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 515 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.