Pascal Guide, Meaning , Facts, Information and Description
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 = 10 hectopascal
The same unit is used to measure stress, Young's modulus and tensile strength.
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2 Comparison to other units of pressure 3 External links |
(See SI prefix for guide to units.)
Examples of various values (approximately)
| 0.5 Pa | Atmospheric pressure on Pluto (1988 figure; very roughly) |
| 9.81 Pa | The pressure caused by a depth of 1 mm of water¹ |
| 1 kPa | Atmospheric pressure on Mars |
| 10 kPa | The pressure caused by a depth of 1 m of water, or the drop in air pressure when going from sea level to 1000 m elevation¹ |
| 101.3 kPa | Atmospheric pressure at sea level¹ |
| 10 MPa | Pressure washer forces out water at this pressure |
| 100 MPa | Pressure at bottom of Mariana Trench, about 10 km under ocean¹ |
| 10 GPa | Diamond forms |
| 100 GPa | Theoretical tensile strength of carbon nanotubes (CNTs) |
Comparison to other units of pressure
| 1 bar | 100,000 Pa |
| 1 millibar | 100 Pa |
| 1 atmosphere | 101,325 Pa |
| 1 mmHg (or torr) | 133 Pa |
| 1 inch Hg | 3,386 Pa |
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