Meaning of Density

What is Density:

The density It is a scalar magnitude that allows us to measure the amount of mass in a certain volume of a substance.. The word, as such, comes from the Latin densitas, density.

In the area of ​​physics and chemistry, the density of a material, whether liquid, chemical or gaseous, is the relationship between its mass and volume; is designated by the Greek letter rho “ρ”.

The formula to calculate density of an object is:

ρ = m / v

This means that density (ρ) is equal to mass (m) divided by volume (v). From which, furthermore, we can deduce that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the greater the density.

The density is one of the physical properties of matterand can be observed in substances in their different states: solid, liquid and gas.

According to the International System of Units, the units to represent density is the next:

Kilograms per cubic meter (kg/m3).

However, other ways of representing density are also common, such as grams per cubic centimeter (g/cm3), kilograms per cubic decimeter (kg/dm3) and grams per cubic decimeter (g/dm3) for gases.

So, for example, the water density is 1000 kg/m3that is, less than that of lead, which is 11,350 kg/m3.

On the other hand, as density we also refer to the quality of dense, in which case it is synonymous with thick, solid. For example: “They crossed the dense jungle.”

Density allows us not only to calculate the amount of matter in a given space, but also the number of individuals, which is called demographic density.

You may be interested:  Coulomb Law

See also Intensive and extensive properties of matter

Density Types

absolute density

The absolute density is an intensive magnitude of matter; It is used to express the relationship between the mass and the volume of a substance. It is usually formulated in kg/m3.

Relative density

As relative density is called that which exists between a substance in relation to another substance that is taken as a reference. The density of water at a pressure of one atmosphere at 4 °C is generally used as the reference density, under which conditions the density of water is 1000 kg/m3.

Apparent density

The apparent density is that which presents materials that are made up of heterogeneous materials. An example of this would be the soil, which is made up of various substances and contains air interstices within it. Therefore, its total density is actually lower than if it were compact.

medium density

The average density is that which is calculated for a heterogeneous system. To obtain the average density, the mass of the object is divided by its volume.

point density

Point density is used to calculate the density in heterogeneous systems that have a different density depending on the point, position, or portion of a substance.

Population density

Population density or demographic density is the number of individuals that, per unit area, live in a given place. Although population density does not accurately reflect reality, it is used as a relative meter, hence it is also called relative population.

Population density is expressed in individuals per square kilometer (kmtwo). Rural areas tend to have lower population density than urban areas. Some of the most densely populated cities in the world are Macau in China, Singapore, Hong Kong and Monaco.

You may be interested:  Meaning of Disease

Population density is calculated in order to seek a balance between existing resources and their use by the inhabitants.

see also

  • Dough
  • Volume
  • Magnitude
  • Population density