When determining the density of an irregular solid using water displacement, what is measured?

The correct answer is the volume of water displaced.

Unit lens: Check the units before giving the final statement so the physics quantity is not swapped. This question asks: When determining the density of an irregular solid using water displacement, what is measured. The correct response is the volume of water displaced, because the particle model explains the observable property using particles. In Density of materials, the marking point should connect directly to required practical activity 5: use appropriate apparatus to determine densities of irregular solid objects. 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 61 is distinct because it uses this exact question context and the unit lens rather than a generic particle-model sentence.