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Chemistry · Ch 1 — Some Basic Concepts of Chemistry

Density

1.3.6

Density

The two properties discussed just before this — mass (1.3.4) and volume (1.3.5) — are related through density:

Density=MassVolume\text{Density} = \frac{\text{Mass}}{\text{Volume}}

Density of a substance is its amount of mass per unit volume. Its SI unit is obtained from the SI units of the two quantities it is built from, exactly as the book derives it:

SI unit of density=SI unit of massSI unit of volume=kgm3    or kg m−3\text{SI unit of density} = \frac{\text{SI unit of mass}}{\text{SI unit of volume}} = \frac{\text{kg}}{\text{m}^3} \;\; \text{or kg m}^{-3}

This unit is quite large, so a chemist often expresses density in g cm⁻³, where mass is in grams and volume in cm³. …

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