Another division of the bar is the least used baria, Barye in English, which is one millionth of a bar. Therefore 1 millibar equals 1000 bar. The millibar is often used, for example in the news media, to signal atmospheric pressure. However, gradually is gaining the hectopascals (hPa) as a unit for measuring pressure, especially in the arrangements and measures provided by the meteorological stations. The use of bar and millibar to indicate pressure measurements has been declining since, in 1971 adopted the International System unit of pressure, the pascal (Pa), which is equivalent to a total force of one newton acting uniformly over an area one square meter. Earlier in the SI simply stated pressure in N / m². The mean atmospheric pressure is 1013 millibars, but is often rounded to 1015 or 1016 mbar. Not to be confused with the unit of measurement standard atmosphere (atm), which has agreed to set at exactly 1013.25 mb. When atmospheric pressure is greater than 1013 millibars have a high pressure or anticyclone. When atmospheric pressure is lower than 1013 mbar, by contrast, is said to have low pressure, storm or cyclone. - A millibar is equal to 0.75006 mm of mercury, mmHg, (another commonly used unit to measure pressure, such as systolic or diastolic pressure of a person). - A millibar, a Torricelli barometer, would be approx. 0.75 mm Hg in height (0.7500616 mm Hg). If it were a bar, the mercury in the barometer would amount to 750.06 mm Hg. - A millibar is equal to the pressure of just over an ounce (1.0197 g) per cm ². The pressure of one bar is equal to the pressure of 1.0197 kg / cm ². This is, in a Torricelli barometer, which was designed with a cross-section of 1 cm ² at the base, (and standard gravity conditions), the fluid would weigh slightly more than 1 kg: 1019.7 g. - A standard atmosphere (atm) of pressure is exactly 1013.25 millibars or hPa, and is 760 mm Hg in the barometer. Be balanced with the weight of about 1033.227 g of mercury (on a device with a useful section of 1 cm ² and value of standard gravity) as equivalent to 1.033227 kg / cm ² pressure. - With a different value for the standard atmosphere (atm), there is also called technical atmosphere (at) ? 1 kgf / cm ², (1 kilogram force per square centimeter). A = 1.0332 at atm. One bar is equal at 1.0197. Equals 1 at 980.665 mbar or hPa. Note: please note that in the Anglo-Saxon point numerical notation. " is like our comma "," and vice versa. So to indicate "a thousand nineteen point seven" we wrote 1019.7 and 1019.7 Anglo notation. This article from the wikipedia in Spanish or Castilian is drafted according to the common uses of writing numerical nomenclature SI: universal. And the symbols of the International System (and Grammar) do not accept abbreviations, or point, or capitalized. Text is available under the Creative Commons Attribution ShareAlike 3.0, additional terms may apply. See Terms of Use for more information.
As a physical parameter, the pressure, like temperature, plays an extremely important role in most areas. From the viewpoint of thermodynamics, it is an intensive quantity. In mechanics, the pressure is defined locally from the force component normal to the surface on which it operates. If we consider an elementary surface dS of normal, experiencing a force, then the pressure p is defined by:. The term obtained by constructing the ratio of the component of force tangential to the surface of exercise is called the shear stress. It is homogeneous pressure and is brought into play in the phenomena of viscosity among others. In continuum mechanics, the pressure is defined as one third of the trace of the stress tensor that is to say, the average diagonal terms of this tensor. Incompressible fluid mechanics, pressure is the Lagrange multiplier for verifying the incompressibility of the material. We then make an implicit definition of pressure. For a Newtonian fluid, the pressure is strictly positive because it should provide energy (?U> O) to decrease the volume (?V <O). For non-Newtonian fluids, it is possible to have negative pressure. These negative pressures are due to surface effects and are related to surface tension. There are several units of pressure, whose use generally depends on the discipline. By the very definition of pressure, they are often defined as the ratio of a unit force on a unit area. The pascal (symbol Pa) is the unity of the international system. Pressing 1pascal corresponds to a force exerted on a surface 1newton of 1m2: 1Pa = 1N / m². The PSI, the English pound per square inch (PSI) is a unit of Anglo-Saxon widely used particularly in hydraulics, oil hydraulic and hydrostatic. The gram or kilogram per square centimeter (g / cm ², kg / cm ² or kgf / cm ²), often used in particle physics, by extension, to designate a distance regardless of the material concerned (see paragraph link between pressure and distance) or altitude (the "gram" or "kg" to which he refers is not the standard unit of weight, but the kilogram-force). In hydrostatic pressure difference ?p (in Pa) between two points in a fluid is related to the difference of height h (m) between these two points, by the relation ?p = ?gh, where ? is the density of the fluid (kg / m³) and g the acceleration of gravity (a mean value of about 9.81 m / s ² at sea level). Therefore, knowing these last two quantities, the pressure difference is directly proportional to the difference in height, and thus the distance between two points if they are on the same vertical axis. This property is widely used for various devices for measuring pressure, as well as a method of conversion by divers (one bar is equal to ten meters of water), or particle physicists. The measuring of the pressure gauge. For atmospheric pressure, using the barometer. You can also use a gauge to measure pressure of a gas in a vacuum tube or a level meter, devices based on the temperature of boiling liquid.In diving, the pressure on biological tissue and the inspired gases is of great importance. Its variation can be considerable depending on the depth reached. Hydrostatic pressure is variable depending on the depth reached - this increases by 1 bar every 10 meters under water (0.98 bar in freshwater and 1.007 bar in seawater). The buoyant force exerted by a fluid resting on a submerged body can be defined as the resultant of pressure forces applied on the surface of the object. Copyright Text is available under Creative Commons Attribution Share-Alike, other conditions may apply. See Terms of Use for more details and credits graphics. If reused texts of this page, see how to cite authors and include the license. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc.., Charitable organization governed by section 501 (c) (3) tax United States. ..

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