Pascal (unit)
The pascal (symbol: Pa) is the SI derived unit of pressure, internal pressure, stress, Young's modulus and tensile strength, named after the French mathematician, physicist, inventor, writer, and philosopher Blaise Pascal. It is a measure of force per unit area, defined as one newton per square meter.
Common multiple units of the pascal are the hectopascal (1 hPa ≡ 100 Pa), kilopascal (1 kPa ≡ 1000 Pa), and megapascal (1 MPa ≡ 1,000,000 Pa).
On Earth, standard atmospheric pressure is 101 325 Pa. Meteorological barometric pressure reports typically report atmospheric pressure in hectopascals. The kilopascal is used in other applications such as inflation guidance markings on bicycle tires. One hectopascal corresponds to about 0.1% of atmospheric pressure slightly above sea level; one kilopascal is about 1% of atmospheric pressure. One hectopascal is equivalent to one millibar; one standard atmosphere is exactly equal to 101.325 kPa or 1013.25 hPa or 101,325 Pa. The corresponding Imperial unit is pounds per square inch (psi).
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Famous quotes containing the word pascal:
“If Montaigne is a man in the prime of life sitting in his study on a warm morning and putting down the sum of his experience in his rich, sinewy prose, then Pascal is that same man lying awake in the small hours of the night when death seems very close and every thought is heightened by the apprehension that it may be his last.”
—Cyril Connolly (1903–1974)