Symbols, abbreviations, or full names for units of length,Īrea, mass, pressure, and other types. You can find metric conversion tables for SI units, as wellĪs English units, currency, and other data. Since atmospheric pressure at sea level is around 14.7 psi, this will be added to any pressure reading made in air at sea level.Ĭonversion calculator for all types of measurement units. Pounds per square inch absolute (psia) is used to make it clear that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. It is the pressure resulting from a force of one pound-force applied to an area of one square inch. The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in² or lbf/in²) is a unit of pressure or of stress based on avoirdupois units. Use this pressure converter to convert instantly between bars, gigapascals, kilopascals, millibars, newtons per square meter, pounds per square inch and other metric and imperial pressure units. Psia to psi, or enter any two units below: Enter two units to convert From: You can do the reverse unit conversion from Although the Pascal is used more in the scientific context, PSI is used more day-to-day. From tire pressure to gas pressure and quite a few others. The system came into use in England about 1300 and was used primarily in the international wool trade.Ĭurrent Use: PSI is used worldwide to measure a lot of pressures. 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. 1 pascal is equal to 0. We assume you are converting between pound/square inch and inch water 4 ☌.You can view more details on each measurement unit: psi or inch water The SI derived unit for pressure is the pascal. How many psi in 1 inch water The answer is 0.036127291827354. One PSI is approximately 6.895 Pascal (N/m2). More information from the unit converter. 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. How to convert Psi to Atmosphere Atm Standard (psi to atm) 1 psi 0.06804596391019 atm. 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. Its specific values have different definitions. Atmospheres : The standard atmospheric (symbol: atm) is a unit of pressure which is a non-SI units. Psi : Psi is the abbreviation of pound per square inch, and is widely used in British and American. 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). 1.36092 Atmospheres (atm) Visit 20 Atmospheres to Psi Conversion. However, Pascal is not the only unit used for pressure:
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