alleryStart learning →Density is mass per unit volume. Which unit is therefore the SI unit of density?
ANewtons per cubic metre
BGrams per cubic centimetre
CKilograms per square metre
DKilograms per cubic metre
Answer & Solution
Correct answer: D. Kilograms per cubic metre
1. Density is mass divided by volume, so its unit is an SI mass unit divided by an SI volume unit.
2. The SI unit of mass is the kilogram and the SI unit of volume is the cubic metre.
3. The SI unit of density is therefore kilograms per cubic metre.
4. Grams per cubic centimetre is a convenient non-SI alternative, and a newton is a force rather than a mass.
_Source: OpenStax College Physics (CC BY 4.0), Ch 11 "Fluid Statics", section 11.2 Density_
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