The pascal (symbol: Pa) is the SI derived unit of pressure, internal pressure, stress, Young's modulus and ultimate tensile strength, defined as one newton per square metre. It is named after the French polymath Blaise Pascal.
Common multiple units of the pascal are the hectopascal (1 hPa โก 100 Pa) which is equal to 1 mbar, the kilopascal (1 kPa โก 1000 Pa), the megapascal (1 MPa โก 1,000,000 Pa), and the gigapascal (1 GPa โก 1,000,000,000 Pa).
The unit of measurement called standard atmosphere (atm) is defined as 101.325 kPa and approximates to the average pressure at sea-level at 45° N. Meteorological...