Why does increasing the volume of a gas at constant temperature lead to a decrease in pressure (Pressure in gases (physics only))

The correct answer is Gas particles collide less frequently.

Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: Why does increasing the volume of a gas at constant temperature lead to a decrease in pressure (Pressure in gases (physics only)). The correct response is Gas particles collide less frequently, 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 why increasing the volume of a gas at constant temperature decreases its pressure. 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 527 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.