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(October 2011)| |Unit system:||SI derived unit| |Named
after:||Blaise Pascal| |In SI base units:||1 Pa = 1 kg/(m·s2)|
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), megapascal (1 MPa ≡ 1,000,000
Pa), and gigapascal (1 GPa ≡ 1,000,000,000 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