The barometer comes from the union "baro and meter" which refers to a tool to measure atmospheric pressure. The most common way to do it is using a mercury barometer, which is a very old tool, which uses the force per unit area exerted by the weight of the atmosphere, which is the weight of the air acting on the earth, a pressure that is known by the "atmospheric pressure" where this prodigy was discovered by evangelist Torricelli who was an Italian physicist and mathematician.
The mercury barometer is made up of a tube 850 mm high, which contains mercury inside. This tube is made of glass, but its upper end is closed, while the lower end is open. How is it named, the tube is filled with mercury and the order is changed and then placed inside a bucket that will also be filled with this same material.
On the other hand, the mercury in the tube descends until it reaches a height of 760 mm almost at the level of the basin, which is called barometric height. The above is accessed when a vacuum occurs at the upper edge of the tube. This vacuum is named barometric chamber, where finally the atmospheric pressure was given by the variations due to the elevation of mercury after the previous evolution where this variation changes between 737 and 775 mm of elevation.
In the barometer area you can also find other types such as aneroid barometers, of blockhouse.
Aneroid barometer, this is a barometer that does not use mercury but also indicates the atmospheric pressure variations due to the more or less large deformations that a metal box with elastic walls makes to experience, which are what designates the mechanical properties of certain materials.
Barometer of fortin, is the one that is composed of a torricellian tube that does not fit into the mercury contained in a glass cuvette in a cylindrical way assigned by a base of deer skin where its way can be changed by means of a screw that is Support the tip of an ivory cone.
