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# What is Density definition/concept/elaboration

In its broadest usage the word density means thickness and concentration. It can be applied in different contexts and matters, in this way it can be applied both in physics and in chemistry .

It is used in relation to people who attend a public or private space, allowing you to assess the amount of public in it, for example, in a theater play, if most of the seats are empty it indicates that there is a small number of people in the theater .

### Physics: relationship between mass and volume of a substance or body

On the other hand, in relation to chemistry and physics, density is the relationship established between the mass and volume of a substance or body. For example, let’s imagine a small object , if it is made of lead, it will be denser than a larger object , but made of cork or foam.

### Density can be measured directly or indirectly

The indirect measurement of density establishes the measurement of mass and volume separately and then the density is calculated. Mass is measured on a scale , but volume is measured by determining the shape of the object.

There are bodies that are capable of floating on water, as in the case of wood and oil, this is because they are less dense than those mentioned. In turn, other materials have a higher density that allows them to sink in water, such as stone or eggs (which allows them to be boiled and used as food).

Solid bodies are measured on scales, so we know the magnitude of their mass, being immersed in water allows us to know their volume. Both results, mass and volume, allow us to know the density.

### Instruments for measuring density

However, among the instruments with which densities are usually measured are the following: the densimeter (measures the density of liquids) which can be replaced by a graduated cylinder to obtain an accurate measurement; the pycnometer (measures solids, liquids and gases); the hydrostatic balance (measures the densities of solids) and the Mohr balance (provides the precise density of a liquid).

Meanwhile, pressure and temperature are the two conditions that directly affect the variation in density of a substance.

### Population density: number of inhabitants per surface unit

On the other hand, population density is called the number of inhabitants per surface unit, whether by continent , state , country, city, district, neighborhood, among others, that is, the population density, measured by the ratio between the population. and the surface of the territory.

Generally, in a country, urban regions have a higher population density compared to rural ones.

However, almost as a paradox, regions that are more densely populated tend to be smaller in relation to less populated ones, those that have long distances in kilometers.

This situation, quite common nowadays, presents a housing problem in large cities, so there is not enough space to accommodate so many people, on the other hand, in the rural environment this development is not viable, as there are not enough people living in it. those places.

Thus, in large cities, people live as is popularly said, side by side, while in the countryside, large territorial surfaces, without constructions, give a feeling of space.

That’s why there are so many people, they are tired of the stress of the city and for this matter of living in certainly small spaces, there is no place for more buildings or large constructions, that’s why these people decide to live in suburban areas or move to the countryside , just to find what the city lacks: tranquility, space and greenery.

However, there are those who don’t care about anything, it’s okay to live next to each other or not have enough space, as these people love the benefits of big cities, such as easy access to transportation everywhere. , places of entertainment, greater offer of work and study , among others.