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There are two types of gauges: electric and mechanical.
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It serves as an early warning system for all sorts of potentially expensive problems-if only you know how to read it. Official SI website: Table 8.How much do you know about your car’s motor oil? You may already know the difference between synthetic and conventional oil and why it's important to have regular oil changes, but how about your oil pressure gauge? The oil pressure gauge is one of your car's most important instruments.There is also a character "bar": Template:Unicode. Unicode has a character for "mb": ( Template:Unicode), but exists only for compatibility with legacy Asian encodings. As a result, decibars are commonly used in oceanography. Specifically, an increase of 1 decibar occurs for every 1.019716 m increase in depth close to the surface. In water, there is an approximate numerical correspondence between the change in pressure in decibars and the change in depth from the sea surface in meters. The alteration of units of measure for this purpose is now deprecated, with qualification of the physical property being preferred, e.g., "The gauge pressure is 2.3 bar the absolute pressure is 3.3 bar".
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When absolute pressure is desired, it is sometimes denoted 'bara' or 'bar(a)' for "bar absolute". For example, if someone says that their car tyres are pressurised to 2.3 bar they actually mean bar gauge: the pressure in the tyre is really 3.3 bar, but only 2.3 bar above atmospheric, which is the scale a tyre gauge would read. This is gauge pressure and denoted by barg, often written with no spaces, spoken "bar gauge", and sometimes using symbols such as 'bar(g)'. In some countries, pressure is measured with reference to atmospheric pressure. In particular, Canadian weather reports use kilopascals (which could also be called centibars).Īmericans are familiar with the millibar in US reports of hurricanes and other cyclonic storms, where lower central pressure generally means higher winds and a stronger storm.
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Similar pressures are given in kilopascals in practically all other fields, where the hecto prefix is hardly ever used. After the introduction of SI units, others use hectopascals (which are equivalent to millibars) so they could stick to the same numeric scale. Meteorologists worldwide have long measured air pressure in millibars. The SI unit is the pascal (Pa), with 1 mbar = 100 Pa = 1 hPa = 0.1 kPa. Despite millibars not being an SI unit, they are still used locally in meteorology in some countries to describe atmospheric pressure. The bar and millibar were introduced by Sir Napier Shaw in 1909 and internationally adopted in 1929.Ītmospheric air pressure is often given in millibars where "standard" sea level pressure is defined as 1013.25 mbar ( hPa), equal to 1.01325 bar. Its official symbol is "bar" the earlier "b" is now deprecated, but still often seen especially in "mb" rather than the proper "mbar" for millibars. The word bar has its origin in the Greek word βάρος (baros), meaning weight. (A pascal is one newton per square meter.)