Bars to Pounds per square inch Conversion Table. So to convert from PSI to bar multiply by this number. As such, the prototype pound at the time was known as the avoirdupois wool pound.Ĭurrent use: The psi is fairly widely used to measure numerous pressures, such as tire pressure, scuba tank pressure, natural gas pipeline pressure, among others. So, the answer to the question what is 1 bars in pounds per square inch is 14.503768078947 psi. 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. History/origin: Pound-force per square inch is a unit that originated in the imperial and US customary systems of units. One psi is approximately 6,895 pascals (N/m 2).
It is defined as the pressure that results when a force of one pound-force is applied to a one-square-inch area. Buy 0-60 Psi Pressure Gauge,1/8Bspt Thread Pressure Meter,Double Scale for bar/psi Measurement,for Air,Hydraulic,Oil Pressure Measurement: Pressure Gauges.
Pound-force per square inchĭefinition: A pound-force per square inch (symbol: psi) is an imperial and US customary unit of pressure based on avoirdupois units. Meteorologists and weather reporters worldwide often use this unit for convenience, since working in pascals would result in much larger values. Millibars (symbol: mb) are also commonly used when referencing atmospheric air pressure, where atmospheric pressure equals 1013.25 mbar (101.325 kPa). 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. The term "bar" comes from the Greek word "baros," which means weight.Ĭurrent 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. History/origin: The unit, bar, was introduced by Vilhelm Bjerknes, a Norwegian meteorologist who founded modern weather forecasting. It is equal to 0.987 atmospheres (101,325 Pa), the unit often used as a reference of standard pressure. Since the tanks are usually filled up to 3000 psi, it is much easier to make the calculations and knows when to come back.Definition: A bar (symbol: bar) is a metric unit of pressure that is defined as exactly 100,000 pascals (symbol: Pa). This is due to the three-thirds rule (one-third of the gas is used for the outbound trip, one-third is for the return trip, and the last one-third is a safety reserve). On the other hand, in technical cave diving, users often prefer to use tanks that express the measurement in psi. Just remember 1 liter is equivalent to 0.0353147 ft3, and you will understand why. However, more complicated calculations are needed to know the cubic feet left using the imperial system. If you multiply the bars left in your tank by the liters it has, you will know how many liters of air you have left. Scuba tanks are usually filled at 200 bar pressure, and bottles have an air capacity of 10 l., 12 l., 15 l., or 18 l. At least, sometimes.įor example, using the metric system, it is easier to calculate the liters of air left in the bottle. The truth is that choosing one system or another could make a scuba diver’s life easier. The difference between psi and bar goes beyond your favorite metric system.
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