The prototype for this system was what at the time was called the avoirdupois wool pound. The system is believed to have originated in England around 1300 and was used in the wool trade. Pounds and square inches were standardized in 1959. It's based on the avoirdupois system, which is based on pounds. Pounds per square inch are a unit of measure that originated in the imperial and US customary units. It is defined as the pressure that happens when one pound-force is applied to a one-square-inch area.
Meteorologists and weather reporters often use this unit for convenience because working in pascals would result in much larger values.Ī pound-force per square inch (symbol: psi) is an imperial and US customary unit of pressure. One millibar is also a common unit for atmospheric air pressure, as the atmospheric pressure at sea level amounts to 1013.25 millibars (or 101.325 kilopascals). The International Bureau of Weights and Measures has specified the bar as a unit that authors may use but has chosen not to include it in the list of non-SI units accepted for use with SI. The metric unit of pressure is the bar, but this term is not accepted by the International System of Units and is even deprecated in certain fields. He got the term from the Greek word "baros," which means weight. The bar, a unit of pressure, was created by Vilhelm Bjerknes, a Norwegian meteorologist who first introduced modern weather forecasting. It can be used as a reference of standard pressure, and it equals 0.987 atmospheres. A bar is a unit of pressure that is defined as being exactly 100,000 pascals.
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