How does reducing the volume of a gas at constant temperature affect its pressure (Increasing the pressure of a gas (physics only) (HT only))

The correct answer is It increases the pressure..

Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: How does reducing the volume of a gas at constant temperature affect its pressure (Increasing the pressure of a gas (physics only) (HT only)). The correct response is It increases the pressure., because density links mass and volume, so the answer must preserve which quantity is being calculated. In Increasing the pressure of a gas (physics only) (HT only), the marking point should connect directly to (Physics only) (HT only) Distinguish temperature increase during compression from pressure increase caused by reduced volume. 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 618 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.