# The low density of aluminum is an important advantage

Aluminum is quite light in relation to its workpiece size. This is due to the low density of, in simple terms, collected solid particles in a unit of space. Aluminum has the specific advantage that it has the full stability of a metal structure due to highly chained particles.

### Mass by volume equal to density

The old question of whether one kilogram of feathers or one kilogram of iron weighs more includes a good approach to visualizing the density of a substance. In this way, tucked from behind, the question of whether the kilogram of iron or springs needs more space, the understanding of the density brightens. What needs more space, has a lower density.

The space needed to get the weight on a fabric is defined as its volume. The weight in this example is the mass of the substance. If the mass of the substance, ie its weight, is divided by the volume, the ratio between the required amount of substance and the required space can be determined. This density in aluminum is 2.70 grams per cubic centimeter and is also referred to as its specific gravity.

### Much lighter, but as stable as steel

Aluminum is a soft metal and yet has high stability, which is one of the key advantages because of the weight of the light metal. Even commercially available alloys, whose density and thus weight increases through the alloying partners, only reach about one third of the density of steel. The stability properties are comparable.

The density of aluminum is only an average approximation, which can change due to external influences such as temperature. As long as the metal remains in its solid state, up to the melting point of 660 degrees, the gradual changes in density can be neglected technically.

In general, the density of substances changes in two directions. From a frozen state, the thawing density becomes higher in order to "tip over" at one point and to decrease again due to the increased molecular motion. What is easy to observe with water and ice is rather theoretical with aluminum.

### Comparison with the density of other substances

To classify the density of aluminum, the density of other materials that perform similar tasks should be used for comparison. Dry wood moves in a density range between 0.4 to 0.8 grams per cubic centimeter. Acrylic glass has a density of about 1.2 grams, PVC of 1.36 and quartz glass of 2.2 grams.

Among metals, cast iron, zinc and tin move just below the density of aluminum, steel has about 7.85 grams, titanium 4.5 grams, iron 7.9 grams, chrome 7.2 and gold 19.32 grams per cubic centimeter.

### Tips & Tricks

To get an idea of ​​the range of all densities, you can use the lowest mass density for airgel (0.003 grams) and the highest for the chemical element osmium (22.61 grams).