Pascal (unit)


The pascal (symbol: Pa) is the SI derived unit of pressure or stress. It is a measure of perpendicular force per unit area i.e. equal to one newton per square meter. In everyday life, the pascal is maybe best known from meteorological air-pressure reports, where it happens in the form of hectopascal (1 hPa = 100 Pa).[1] In other cases, the kilopascal is more commonly used, for example on bicycle tire labels.[2] One hectopascal corresponds to 0.1 and one kilopascal to about 1% of atmospheric pressure (near sea level).

It is named after the French mathematician and physicist, Blaise Pascal.

References


  1. World Meteorological Organization: Manual on the Global Observing System – Volume I , Section 3.3.2.2: "The hectopascal (hPa), equal to 100 pascals (Pa), shall be the unit in which pressures are reported for meteorological purposes."
  2. ISO 5775: Bicycle tyres and rims







Categories: Units of measurement




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