![]() ![]() In the former cgs system, the unit of pressure is the barye (symbol ba), which is equal to one decipascal. In the former mts system, the unit of pressure is the pièze (symbol pz), which is equal to one kilopascal. Since official metrication, meteorologists in Canada use kilopascals (kPa), see for example CTV News, weather current conditions in Montréal and CBC weather, current conditions in Montréal, although in some other countries hectopascals are still in use, see for example KNMI, KMI, DWD, JMA, MDD and NOAA.ġ hectopascal (hPa) ≡ 100 Pa ≡ 1 mbar. Therefore, meteorologists use hectopascals (hPa) today for air pressure, which are equivalent to millibars, while 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, many preferred to preserve the customary pressure figures. Meteorologists worldwide have for a long time measured atmospheric pressure in millibars. The Unicode computer character set has dedicated symbols Template:Unicode ( Template:U+) for Pa and Template:Unicode ( Template:U+) for kPa, but these exist merely for backward-compatibility with some older ideographic character-sets and are therefore deprecated. The same definition is used in the compressor and the pneumatic tool industries (ISO 2787). In 1985, IUPAC recommended that standard atmospheric pressure should be harmonized to 100,000 Pa = 1 bar = 750 Torr. This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries. The name pascal was adopted for the SI unit newton per square metre by the 14th CGPM in 1971. The unit is named after Blaise Pascal, the eminent French mathematician, physicist, and philosopher noted for his experiments with a barometer, an instrument to measure air pressure. ![]()
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