Pascal (unit)

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"Pascals" redirects here. For other uses, see pascal (disambiguation).
SI unit of pressure

A pressure gauge reading in psi (red scale) and kPa (black scale)
General information
Unit systemSI unit
Unit ofPressure or stress
Named afterBlaise Pascal
1 Pa in ...... is equal to ...
   SI base units:   kg⋅m−1s−2
   US customary units:   1.450×10−4 psi
   atmosphere:   9.869×10−6 atm
   bar:   10−5 bar
   barye (CGS unit)   10 Ba

The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. The unit, named after Blaise Pascal, is defined as one newton per square metre[1] and is equivalent to 10 barye (Ba) in the CGS system. The unit of measurement called standard atmosphere (atm) is defined as 101325 Pa.[2]

Common multiple units of the pascal are the hectopascal (1 hPa = 100 Pa), which is equal to one millibar, and the kilopascal (1 kPa = 1000 Pa), which is equal to one centibar. Meteorological forecasts typically report atmospheric pressure in hectopascals per the recommendation of the World Meteorological Organization. Forecasts in the United States typically use millibars,[3][4] in Canada these reports are given in kilopascals.[5]