# What is density?

## What Does density Mean

Density , from the Latin densĭtas , is the characteristic of dense . This adjective , in turn, refers to something that has a large amount of mass compared to its volume ; which is dense or solid; that has a significant level of content or is very deep in a reduced dimension; or that it is undefined and unclear.

In chemistry and physics , density is the magnitude that reflects the link between the mass of a body and its volume. In the International System , the unit of density is the kilogram per cubic meter (known by the symbol kg / m3) .

One kilogram of bronze, for example, will take up much less space than one kilogram of feathers. This is explained from the density: bronze is denser (it has more mass in less volume) than feathers. The density differences allow small objects exist but heavy and light but very large objects.
Just as the relationship between mass and volume of a body allows the density of an object to be obtained, demography uses a similar logic to speak of population density . In this case, the magnitude is calculated from the number of inhabitants living in the same surface unit. If a city has 20,000 people spread over a territory of 2 square kilometers, its population density will be 10,000 inhabitants per km2.
The optical density , in turn, refers to the absorption level of brightness. In photography, the concept of density is linked to the darkening of an image according to the amount of light to which it has been exposed.
In computing , density indicates the number of bytes that can be deposited in a memory storage system.
Population density and environmental imbalances
A concept deeply linked to this concept is that of population density , which refers to demography , that is, the number of individuals who live in a given territory.
In order for all species, be it plant or animal, to develop in a certain habitat in a recommendable and equitable way with the environment, it is necessary that there be an even relationship between resources present in the space and their use; If the number of individuals exceeds the amount of resources to be distributed among all, there is talk of an environmental imbalance , where life is endangered in all its aspects.
When this anomaly occurs, it usually happens that naturally a series of changes are carried out in the populations to avoid the excessive increase of the community and ensure the survival of the species . Some of these transformations are:

* Slow development (when space and food are scarce, individuals begin to develop slowly and therefore, reproductive processes are delayed, bringing balance to the community);
* Low fertility (due to the weakening of the mothers, due to poor nutrition, the number of offspring decreases and they are more prone to mortality);
* Decrease in the size of individuals (scarcity in turn causes individuals to grow and weigh less);
* Emigration (if possible, part of the population moves to other regions in search of a better quality of life);
* Disappearance of the population (when the damage caused to the natural environment is excessive, the extinction of the species can be generated in said territory. It can occur gradually or abruptly, as if it were an epidemic).
It is worth mentioning that in the case of human beings, due to the fact that there are very few birth control measures that exist and that, thanks to scientific advances, the mortality rate takes place at an older age, we have come to overpopulate the planet . If comprehensive measures were not in place to equalize the distribution of resources and at the same time control the level of births, it would be impossible not only to end world hunger , but also to ensure a prosperous life for the species in any corner of the planet.

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