4.3.1—Density
- Syllabus
- 9702–2028–2029
- Objective
- 4.3.1
- Level
- AS
Density is mass per unit volume and links material amount to size
Density is ρ=m/V. It is a property of a material sample at specified conditions, while mass and volume describe the particular object.
Use consistent units and distinguish an object’s external volume from the volume of material if voids or hollow regions are present.
A 0.54 kg metal block occupying 2.0×10⁻⁴ m³ has density 2700 kg m⁻³, consistent with aluminium.
A larger sample of the same uniform material is not automatically denser; changing mass and volume proportionally leaves ρ unchanged.
ConceptA-Level CAIE Physics AS