![]() ![]() Meteorologists and weather reporters worldwide often use this unit for convenience, since working in pascals would result in much larger values.ġ5 psi = 15 × 0.0689475729 bar = 1. 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. Choose a value between 0 and 3.5 bar from the car tyre pressure conversion table below, to obtain the converted value in psi. Barĭefinition: A bar (symbol: bar) is a metric unit of pressure that is defined as exactly 100,000 pascals (symbol: Pa). Enter a car tyre pressure in bar below to convert it to the equivalent car tyre pressure in psi. The formula would look like this: Y psi X bar 14. 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. To convert bars to pound-force per square inchs you simply multiply your bars by 14.5037680789. 206,451,200,000,000 8896443230521 (fraction) Pounds per Square Inch Bars to Pounds per Square Inch Conversion Formula X psi 14.503773773021 × Y bar where X is the result in psi and Y is the amount of bar we want to convert 1. 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. 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. However, if you practice enough, you’ll be able to do the same in any units of measurement you choose.Definition: A pound-force per square inch (symbol: psi) is an imperial and US customary unit of pressure based on avoirdupois units. Water pressures for different depths at different elevations.Īs you can see, using metric measurements like bar and m is a lot more intuitive than imperial ones due to the decimal base (multiples of 10). ![]() ![]() You’ll find all measurements in metric and imperial units and for simplicity sake, we assume freshwater and saltwater to be identical in pressure and density. Here are some examples for you to practice. For more accurate calculations, use the scuba diving water pressure calculator above. If you follow this quick approach, you should get by just fine. If we want to calculate how many Pounds per Square Inch are 1.6 Bars we have to multiply 1.6 by 129032000000000 and divide the product by 8896443230521. Therefore, when diving at 20m/66ft depth in a mountain lake at 2,000m/6,600ft elevation, you’ll experience 3.8bar/atm of pressure. When diving at altitude, subtract 0.1bar/atm per 1,000m/3,300ft elevation. This means, at 10m / 33ft depth, the water pressure is 2 bar/atm and at 30m/99ft around 3bar. How to determine the water pressure at depthįor quick calculations of the water pressure at depth, add 1 bar/atm per 10m / 33ft of water depth to the 1 bar/atm of atmospheric pressure. Switching for saltwater to freshwater will give you slightly lower pressures, as the density is smaller.Ītm measurements are more or less identical to bar. Depending on the diving depth you entered, and the elevation you’re at (for altitude diving), you will receive different results in bar, psi, and kPa. How to determine the water pressure at depth 10m / 66ft, 2,500m / 8,250, 1.75bar / 1.75atm / 25.63psi 16m / 53ft, Sea level (0m / 0ft), 2.6bar / 2.6atm /. ![]()
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