A barometer is an indicator or an estimate about a certain state or condition. For example: “The reading barometer shows that, in our country, the favorite books belong to the self-help genre”, “The European Union has presented a barometer on the consumption habits of adolescents”, “The government denied the barometer about people living on the streets ».
A monthly periodicity is the one that these barometers or estimates usually have, which, for example, are made by the Spanish Sociological Research Center (CIS). Specifically, these studies are undertaken to find out the state of opinion in the society of that country on a specific issue or topic.
More precisely, those are based on a block of fixed-type questions that are used for said body to develop the so-called barometer indicators. However, there is also another set of questions of a variable class that usually refer to questions of a social or political nature.
Thus, for example, it is very common for these barometers to be carried out some time before the national elections take place to estimate what the result will be and what percentage of citizens plan to go to the polls to participate in this democratic process so important.
Barometer, on the other hand, is that device that is used to measure the pressure of the atmosphere. This means that the barometer calculates the weight of the atmosphere per unit area.
There are different types of barometers, such as the mercury one, which indicates the atmospheric pressure of a gaseous matter according to the differences existing in the level of two vessels that contain mercury and that are interconnected.
A metallic barometer is one formed by a metal container whose walls are characterized by their elasticity. The shape of this container is modified according to the changes in atmospheric pressure from the extraction of air. Said modification, for its part, is amplified through a needle that indicates the pressure that exists. The holosteric barometer and the aneroid barometer are other kinds of metal barometers.
In this sense, it must be established that it is very important to know that metallic metals have the ability to be much less sensitive than mercury, but on the other hand they are much more easily transportable and also much more practical. Specifically, we can determine that one of the most used is the holosteric.
There is also the recording barometer, which is one that records, in an automatically rotating cylinder, changes in atmospheric pressure.
The mathematician and physicist Evangelista Torricelli was the first to develop different types of barometers during the 17th century. The first barometers consisted of a column of liquid that was enclosed in a tube, the upper part of which remained closed. The weight of this column of liquid managed to be exactly balanced with the weight of the atmosphere.
However, we can also highlight the existence of other relevant barometers, such as the one carried out by Fortin. This is characterized because, although it is based on the one that Torricelli designed, it is much more perfected.