- This article is about the unit of pressure. For other uses see Pascal (disambiguation)
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
Table of contents |
2 Comparison to other units of pressure 3 External links |
Examples of various values (approximately)
0.5 Pa | Atmospheric pressure on Pluto (1988 figure; very roughly) |
10 (really 9,81) 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, or 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
[http://www.ex.ac.uk/cimt/dictunit/ccpress.htm Conversion Calculator for Units of
PRESSURE & STRESS]External links