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# 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 10 kPa The pressure at a depth of 1 m of water, orthe 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

[http://www.ex.ac.uk/cimt/dictunit/ccpress.htm Conversion Calculator for Units of PRESSURE & STRESS]

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