Which unit is used to express density in the metric system ? P43-050 Density of materials checkpoint

The correct answer is kg/m³ ? P43-050 density measurement and calculation.

Unit lens: Check the units before giving the final statement so the physics quantity is not swapped. This question asks: Which unit is used to express density in the metric system ?. The correct response is kg/m³ ? P43-050 density measurement and calculation, 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 volume of a regular solid using length measurements. 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 73 is distinct because it uses this exact question context and the unit lens rather than a generic particle-model sentence.