If the volume of a gas decreases while the temperature remains constant, what happens to its pressure (Pressure in gases (physics only))

The correct answer is It increases.

Boundary lens: Keep this separate from nearby specification points that use similar words but test a different idea. This question asks: If the volume of a gas decreases while the temperature remains constant, what happens to its pressure (Pressure in gases (physics only)). The correct response is It increases, 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) Identify pressure in pascals and volume in metres cubed when using the pressure-volume relationship. 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 562 is distinct because it uses this exact question context and the boundary lens rather than a generic particle-model sentence.