Which of the following statements about density is true?

The correct answer is Density changes with temperature and pressure..

Comparison lens: State both sides of the comparison so the contrast is explicit rather than implied. This question asks: Which of the following statements about density is true. The correct response is Density changes with temperature and pressure., because density links mass and volume, so the answer must preserve which quantity is being calculated. In Density of materials, the marking point should connect directly to describe how to determine the density of a liquid using a balance and measuring cylinder. 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 Changes of state and the particle model, 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 89 is distinct because it uses this exact question context and the comparison lens rather than a generic particle-model sentence.