*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 |

## External links

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