![]() ![]() ![]() Make it part of your tyre maintenance routine, as well as taking time to check your tyre’s tread depth and see if there’s any damage. It’s very easy for tyres to become deflated if they aren’t checked regularly, so how often should you check tyre pressure? A tyre typically loses around 1 psi (0.07 bars) per month and this can result in uneven wearing of the tread, so we recommend checking your tyres every two weeks as well as before motorway driving and long journeys. Many fuel stations also offer an air pump service, with some services free. If you don’t have a tyre pressure gauge at home you can always visit your local HiQ centre where we’ll check your tyre pressure for you. And don’t forget to check the tyre pressure on your spare tyre too, as it will naturally lose pressure over time.Make sure you check all four tyres, as pressure in each tyre can vary.Check the reading to see whether you need to deflate or inflate your tyres.Gently push the gauge down until you get your reading.Remove the tyre valve dust cap and place the pressure gauge onto the valve.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.Using a tyre gauge is one of the quickest and easiest ways to check if your tyres are inflated correctly. ![]() 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. Barĭefinition: A bar (symbol: bar) is a metric unit of pressure that is defined as exactly 100,000 pascals (symbol: Pa). 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. 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. Definition: A pound-force per square inch (symbol: psi) is an imperial and US customary unit of pressure based on avoirdupois units. ![]()
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