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( Kilopascal)
The pascal (symbol Pa) is the SI derived unit of pressure, stress, Young's modulus and tensile strength. It is a measure of perpendicular force per unit area i.e. equivalent to one newton per square meter or one joule per cubic metre. In everyday life, the pascal is perhaps best known from meteorological barometric pressure reports, where it occurs in the form of hectopascals (1&_160;hPa = 100&_160;Pa).[1]. In other contexts, the kilopascal is more commonly used, for example on bicycle tire labels.[2] One hectopascal corresponds to about 0.1% and one kilopascal to about 1% of atmospheric pressure (near sea level) one hectopascal is thus equivalent to a millibar; one atmosphere is equal to 1013.25 hPa. 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. The name pascal was adopted for the SI unit newton per square metre by the 14th CGPM in 1971. [1] Standard atmospheric pressure is 101,325&_160;Pa = 101.325&_160;kPa = 1013.25&_160;hPa = 1013.25&_160;mbar = 760&_160;Torr. This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries. In 1985, IUPAC recommended that standard atmospheric pressure should be harmonized to 100,000&_160;Pa = 1&_160;bar = 750&_160;Torr. The same definition is used in the compressor and the pneumatic tool industries (ISO 2787).[3]
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