![]() ![]() It is based on the avoirdupois system, a system that uses weights in terms of the avoirdupois pound, which was standardized in 1959. History : This unit finds its history in the imperial and American system of units of measure. One PSI is approximately 6.895 Pascal (N/m2). It is defined as the pressure created when a force of one pound-force is applied to a surface of one square inch. To be able to do this anyway, an average approximation is always used.ĭefinition : A PSI is a unit used worldwide. Because it is not the same everywhere, you cannot simply apply a conversion factor to convert PSI to Pa or bar. The pressure that a Pound delivers depends on gravity which is not the same everywhere on earth. The PSI is an American unit and stands for Pounds per Square Inch. 1 atmosphere is therefore 1013 millibars and 1013 hectopascals. In this case, 1 millibar is exactly equal to 1 hectopascal. Air pressure is also regularly expressed in millibars or hectopascals. The atmosphere corresponds more closely to the average air pressure at sea level, and is defined as follows: 1 atm = 101.325 Pa so just over 1 bar. Meteorologists and weather forecasters worldwide use this unit, as an expression in Pascal would lead to much longer numerical results. Where atmospheric pressure equals 1013.25 mbar (101.325 kPa). Millibars (symbol: MB) is also commonly used to describe atmospheric pressure. The International Bureau of Weights and Measures, while indicating that authors are free to use bar, has not included it in the permitted list of the SI. ![]() The term “bar” comes from the Greek word “baros,” meaning weight.Ĭurrent usage : Although bar is the unit of pressure, it is not accepted by the International System of Units (SI) and is even disapproved in some areas. History: Bar was once introduced by Vilhelm Bjerknes, a Norwegian meteorologist who was at the forefront of modern weather forecasting. This unit is pretty much the standard reference when it comes to pressure. The bar is defined as 100,000 Pa, or 100 kPa. The bar is originally a British unit, and 1 bar roughly corresponds to the average air pressure at sea level (although 1 atmosphere (atm) is a better description). psi to kg/cm² → 1 psi = 0.However, Pascal is not the only unit used for pressure:.psi to torr → 1 psi = 51.715 torr (mmHg).Psi is a pressure unit and equals to the force of one pound applied to one square inch. Learning how to convert psi to bar is rather easy! How to convert Psi (Pound Force Per Square Inch) to other pressure units Pa to torr → 1 pascal = 0.0075 torr (mmHg).It has several multiples and sub-multiples that are formed using the standard SI units that are also commonly used.Ĭommonly used multiples of Pascal: hectopascal (hPa), kilopascal (kPa) and megapascal (MPa), Commonly used sub-multiples: milipascal (mPa), nanopascal (nPa) etc. How to convert Pascal (Pa) to other pressure unitsĭo you know what is a Pa? Pascal is a unit of pressure in the metric system, equal to 1 newton per square meter. Interested in learning what is mmHg and how to convert it to other pressure units?Ī millimeter of mercury is a manometric unit of pressure, defined as exactly 133.322387415 pascals. How to convert Milimeters of Mercury to other pressure units ![]()
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