Density of materials

Both bodies in the picture on the right (on the left: Wood, on the right: Aluminum) have an equal mass of 200 g. Nevertheless they strongly differ in its volume.
If their volume would be equal one could notice that the piece of aluminum is by far heavier than the wooden piece.
If one compares several materials in that way (e.g. iron with plastic, Ice and Copper, etc.)one can conclude:

Bodies with the same volume that are made of different materials differ in their masses.

Density is defined as the ratio between the mass of a body and its volume.

it applies:

• In addition the density of solid and fluid matrials depends on its temperature.
• The density of gazeous materials depends both on its temperature and its pressure.

Here are some examples for the density of materials.