What is the formula for calculating the density of a material, and what units are used for mass and volume?

The formula for calculating density is density = mass/volume. The mass is measured in kilograms (kg) or grams (g), and the volume is measured in cubic meters (m³) or cubic centimeters (cm³).

Practical lens: Link apparatus, readings, and uncertainty to the exact measurement named in the objective. This question asks: What is the formula for calculating the density of a material, and what units are used for mass and volume. The correct response is The formula for calculating density is density = mass/volume. The mass is measured in kilograms (kg) or grams (g), and the volume is measured in cubic meters (m³) or cubic centimeters (cm³)., 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 make and record measurements needed to determine densities of regular 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 50 is distinct because it uses this exact question context and the practical lens rather than a generic particle-model sentence.