Density

The weight (mass) of a substance in a given volume (of that same substance). Examples of commonly used units are kg/m³ or g/cm³ for solids, and kg/l or g/ml for liquids and gases. Referring to a substance's density is to describe how heavy a substance is for its size.

Source: GreenFacts

Examples: water has a density of 1 kg/l, chlorine has a density of 3.1 kg/m3 and iron has a density 7.5 kg/m³. Link to weight units toolbox

Español: Densidad

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