Pascal

The pascal (symbol Pa) is the SI unit of pressure. It is equivalent to one
newton per square metre. The unit is named after Blaise Pascal, a French
mathematician, physicist and philosopher.

Since 1 Pa is a small pressure, the unit hectopascal (symbol hPa) is more
widely used, especially in meteorology. The unit kilopascal (symbol kPa) is
also in common use.

     1 hectopascal = 100 pascal = 1 millibar.
     1 kilopascal = 1000 pascal

The same unit is used to measure stress, Young's modulus and tensile
strength.

Examples of various values (approximately)

 0.5 Pa  Atmospheric pressure on Pluto (1988 figure; very roughly)

 10 Pa   The pressure at a depth of 1 mm of water

 1 kPa   Atmospheric pressure on Mars

         The pressure at a depth of 1 m of water, or
 10 kPa  the drop in air pressure when going from sea level to 1000 m
         elevation

 100 kPa Atmospheric pressure at sea level

 10 MPa  Pressure washer forces out water at this pressure

 100 MPa Pressure at bottom of Marianas Trench, about 10 km under ocean

 10 GPa  Diamond forms

 100 GPa Carbon nanotubes (CNTs)

Comparison to other units of pressure

 1 bar        100,000 Pa

 1 millibar       100 Pa

 1 atmosphere 101,325 Pa

 1 mm Hg*         133 Pa

 1 inch Hg*     3,386 Pa

*rounded

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