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The density of an object or substance is its mass divided by its .
The units of density depend on the units used for and volume, but are usually g/cm3.
The more dense a substance is, the it feels for its size.
For example, 1 cm3 of is heavier than 1 cm3 of , which is heavier than 1 cm3 of air.

The in solids are very close together.
They are tightly packed, giving solids densities.
The particles in liquids are together.
Although they are randomly arranged, they are still tightly packed, giving liquids high .
The density of a substance as a liquid is usually only less than its density as a solid.
For example, the density of solid aluminium is 2.72 g/cm3 and the density of aluminium is 2.38 g/cm3.
The particles in gases are very far apart, so gases have a very density.