# density

Definition
Related Terms
Weight (mass) per unit of volume used as a measure of the compactness of a substance. It is commonly expressed as kilograms per cubic meter (kg/m3) or pounds per cubic foot (lb/ft3), although kilograms per liter (kg/l) and pounds per gallon (lb/gallon) are also sometimes used. Density of water is one gram per cubic centimeter (g/cm3), steel 7.9 g/cm3, lead 11 g/cm3, gold 19 g/cm3, ice 0.92 g/cm3, gasoline 0.8 g/cm3, common wood 0.65 g/cm3, cork 0.24 g/cm3, and air (at sea level) 0.0013 g/cm3. Average density (D) is computed by the formula D = m ÷ V where 'm' is the mass of a substance and 'V' is its volume.
Relative density (also called specific gravity) is the ratio of the density of a substance at 20°C or 68°F to the density of water at 4°C or 39.2°F. See also bulk density.

## Use 'density' in a Sentence

The high density of the fishing float made it sink like a stone, while above it a red balloon floated on the water.
Rocks have such a high density, they are heavy so when you throw them at people it will hurt them and people also make tools out of rocks.
If you have ever wondered why wood floats and stone does not, it is because the wood has a lower density than water, but stone is much more dense than water.

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