Which of the following statements is true regarding the relationship between pressure and volume for a fixed mass of gas at constant temperature?

The correct answer is Pressure multiplied by volume is constant.

Particle lens: Describe arrangement, motion, spacing, collisions, or energy changes only when they are relevant here. This question asks: Which of the following statements is true regarding the relationship between pressure and volume for a fixed mass of gas at constant temperature. The correct response is Pressure multiplied by volume is constant, 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) Apply conservation of energy reasoning to work done on a gas. 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 636 is distinct because it uses this exact question context and the particle lens rather than a generic particle-model sentence.