Select Units To Convert.You can find high- and low pressure fittings, tubing and connectors in our online shop. For more exact data, please use the conversion factors: 1psi = 68.9476 mbar 1bar = 14.5038 psiThe SI unit of pressure is pascal (newton per square meter), which equals to 0.01 millibars. Pressure is defined as force per unit area.
Meteorologists and weather reporters worldwide often use this unit for convenience, since working in pascals would result in much larger values. The International Bureau of Weights and Measures has specified the bar as a unit that authors should have the freedom to use but has chosen not to include the bar in the list of non-SI units accepted for use with SI.Millibars (symbol: mb) are also commonly used when referencing atmospheric air pressure, where atmospheric pressure equals 1013.25 mbar (101.325 kPa). The term "bar" comes from the Greek word "baros," which means weight.Current use: Although the bar is a metric unit of pressure, it is not accepted within the International System of Units (SI) and is even deprecated within certain fields.
The system is believed to have come into use in England around 1300 and was used in the international wool trade. It is based on the avoirdupois system, a system that uses weights in terms of the avoirdupois pound, which was standardized in 1959. One psi is approximately 6,895 pascals (N/m 2).History/origin: Pound-force per square inch is a unit that originated in the imperial and US customary systems of units. It is defined as the pressure that results when a force of one pound-force is applied to a one-square-inch area.
Although the pascal is more widely used in scientific contexts, psi is more often used in everyday contexts, particularly in countries like the United States as well as others under the US customary or imperial systems of units.15 bar = 15 × 14.503773773 psi = 217.
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