What is the unit of density?

Prepare for the ATPL Mass And Balance Test. Access flashcards and detailed multiple choice questions with hints. Boost your exam readiness!

Density is defined as the mass of a substance per unit volume. The standard unit of measurement for density in the International System of Units (SI) is kilograms per cubic meter, represented as kg/m³. This unit composition directly reflects the relationship between mass (in kilograms) and volume (in cubic meters), making it easy to understand the concentration of matter in a given space.

The other units in the options pertain to different physical quantities. For instance, the Pascal (Pa) is a unit of pressure, kg is the unit of mass alone without reference to volume, and the Newton is a unit of force. None of these options encapsulate the concept of density, which specifically involves both mass and volume. Thus, the choice of kg/m³ is accurate and widely accepted for expressing density in physics and engineering contexts.

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