1, and the density of copper is 8.9* 10 cubic kilogram/cubic meter.

2. The density of iron is 7.9* 10 cubic kilogram/cubic meter.

3. The density of aluminum is 2.7* 10 cubic kilogram/cubic meter.

No matter what substance, no matter what state it is in, with the change of temperature and pressure, the volume or density will change accordingly. The relationship between temperature T, pressure P and density ρ (or volume) is called the equation of state. The volume of gas varies significantly with pressure and temperature.

Extended data:

1, density and life

The density of human body is only 1.02 g/cm? Only slightly denser than water. Gasoline is less dense than water, so any oil stains you see on the road will float on the water. The density of seawater is greater than that of water, so the human body floats easily in seawater. (Dead Sea density reaches 1.3g/cm? It is denser than human beings, so people can float in the dead sea. )

2. Agricultural application

It is an important foundation of density. It can be used to judge soil fertility in agriculture. Soil with more humus is more fertile, and its density is generally 2.3× 10? Kilogram/meter? . When selecting seeds, we can select seeds according to the ups and downs of seeds in water: full and strong seeds sink due to high density; The seeds of shriveled shells and other weeds float on the water because of their low density.

In industrial production, such as the production of starch, potatoes are used as raw materials. Generally speaking, potatoes with more starch have higher density, so the yield of starch can be estimated by measuring the density of potatoes.

3. Industrial application

Before casting metal, the factory needs to estimate how much metal needs to be melted, and can calculate the required metal amount according to the volume of the mold and the density of the metal.