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A barometer is a indicator or one estimate about a certain state or condition. For example: “The reading barometer shows that, in our country, favorite books belong to the genre of self-help”, “The European Union has presented a barometer on teenagers' consumption habits”, "The government denied the barometer about people living in a street situation".

A monthly periodicity is the one that these barometers or estimates usually have, for example, by the Center for Sociological Research (CIS) in Spain. Specifically, these studies are undertaken to know the state of the opinion of the society of that country on a particular issue or issue.

More precisely, those are based on a block of fixed-type questions that are those that serve to prepare the so-called barometer indicators. However, there is also another set of variable class questions that routinely refer to social or political issues.

Thus, for example, it is very common for such barometers to be undertaken long before national elections take place to estimate what will be the result of them and what percentage of citizens are planning to go to the polls to participate in this democratic process. so important.

Barometer, on the other hand, is that device used to measure atmospheric pressure . This means that the barometer calculates the weight that the atmosphere exerts per unit area.

There are different types of barometers, such as mercury , which indicates the atmospheric pressure of a gaseous matter according to the differences in the level of two vessels containing mercury and which are intercommunicated.

A metal barometer It is that formed by a metal container whose walls are characterized by their elasticity. The shape of this vessel is modified according to changes in atmospheric pressure from the extraction of air. This modification, meanwhile, is amplified through a needle which indicates the pressure that exists. He holostic barometer and the aneroid barometer They are other kinds of metal barometers.

In this sense, it is necessary to establish that it is very important to know that metallic ones have the capacity to be much less sensitive than those of mercury, but in return they are those much more easily transportable and also much more practical. Specifically, we can determine that one of the most employed is the holostérico.

There is also the recorder barometer , which is the one that records, in a cylinder that rotates automatically, the changes in atmospheric pressure.

The mathematician and physicist Evangelist Torricelli He was the first to develop different types of barometers during the XVII century . The first barometers consisted of a column of liquid that was enclosed in a tube, whose upper part remained closed. The weight of this column with liquid managed to balance exactly with the weight of the atmosphere.

However, we can also underline the existence of other relevant barometers, such as Fortin. This is characterized because, although it is based on the one designed by the aforementioned Torricelli, it is much more perfected.

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