The PSI is an American unit and stands for Pounds per Square Inch. 1 atmosphere is therefore 1013 millibars and 1013 hectopascals. 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. 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). Plus, we also offer nitrogen tyre inflation for those seeking greater tyre performance.However, Pascal is not the only unit used for pressure: Whether you’re concerned about your tyre health, or would like our help to check your tyre pressure (free of charge), simply contact your local branch. Our team is committed to keeping your vehicle in prime health, thanks to our fast and efficient service. Mr Tyre are the trusted local autocentre for Central England, with over 35 branches across the region. Tyre pressure will also be checked by your trusted Mr Tyre autocentre during servicing.Being able to convert easily between them using our converter tool will help when applying manufacturer instructions, reading your gauge output, and communicating with your garage – as they may all operate in different units. This is because tyre pressure can be measured in different units: BAR pressure or PSI (pounds per square inch) being the most commonplace. If you’re wondering what tyre pressure is measured in, units-wise, that’s where our converter tool can help.Many modern cars also have a sensor installed called a TPMS which alerts the driver to the decreasing or low tyre pressure. Use a tyre pressure gauge to check the pressure, and carefully follow the instrument’s instructions.This information can be found by a number of means, including the vehicle manual, inside your fuel cap, on the inner door frame or simply by contacting your vehicle manufacturer. The ideal tyre pressure is determined on a case-by-case basis, and will depend entirely on the make and model of your vehicle, alloys used, load carried, and typical passenger usage – front and rear tyres may also perform better at slightly different pressures to each other.It’s thought that warmer weather can decrease tyre pressure more rapidly, so make sure to check more regularly during the summer months.To get an accurate reading, check it only when your tyres are cold e.g.Tyre pressure should be checked once a month.It’s therefore paramount that you’re keeping tyre pressure in line with the recommended figures for your specific vehicle. The benefits of maintaining the correct tyre pressure include: Both under-inflated and over-inflated tyres can affect how much of the tyre is in contact with the road – this, in turn, will influence safety, performance, longevity and fuel efficiency. Likewise, motorists should also keep assess when inflating tyres of whether their tyres are over-inflated, too. While this is normal, car owners should keep on top of this by regularly checking their tyre pressure. Why is tyre pressure important?Įveryday vehicle use will naturally reduce tyre pressure over time. Simply put, tyre pressure is a measure of how much air is in your tyre, and this is measured in either BAR pressure or pounds per square inch (PSI) – you can convert between them using our online tool.
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