Barometer Meaning

What is a Barometer:

a barometer It is an instrument used in meteorology that is used to measure atmospheric pressure..Barometer

The word barometer is formed from baro-, which comes from the Greek βάρος (báros) and means ‘heaviness’, and the suffix –meterwhich comes from the Greek μέτρον métron, and translates ‘measure’.

Barometers, in addition to allowing us to measure the pressure of the atmosphere, also offer us clues about the weather forecasts. For example, areas with high pressure are characteristic of regions without precipitation, while those with low pressure indicate rain and storms.

Under normal conditions and at sea level, a barometer should mark 760 millimeters of mercury (mmHg) or 1013.25024 hectopascals (hPa).

The barometer unit of measure According to the International System of Units it is the hectopascal (hPa).

The first barometer was invented by the Italian physicist and mathematician Evangelista Torricelli In XVII century.

Also known as a barometer anything that is considered the index or measure of somethingof a process or state. For example: “Street polls are the electoral barometer in the days prior to the democratic referendum.”

types of barometer

mercury barometer

The mercury barometer is an instrument for measuring atmospheric pressure. It was invented by Evangelista Torricelli in 1643. It consists of a glass tube about 90 cm long and a container of any type, both filled with mercury and communicated with each other.

The glass tube is placed in a vertical position, closed at the top (where a vacuum will be created above the mercury level) and open at the bottom. The lower part will be in contact with the container filled with mercury, which in turn is in contact with the gas (in the case of atmospheric pressure, air) that is intended to be measured.

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Variations in the pressure of the atmosphere cause the liquid in the tube to rise or fall, indicating the pressure. The unit of measurement for the mercury barometer is millimeters of mercury (mmHg).

Aneroid barometer

The aneroid barometer, also called a metal barometer or holosteric barometer, is an instrument for measuring the pressure of the atmosphere. It was invented by Lucien Vidie in 1843.

It works thanks to a metallic capsule in which the most absolute vacuum has been produced. This capsule has elastic walls that undergo deformations due to atmospheric pressure. It is these variations that modify the position of a needle that runs along a circular scale graduated in millimeters of pressure. It is adjusted according to the indications of a mercury barometer.