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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, the eminent French mathematician, physicist and philosopher.
Metric meteorology has long used the millibar for air pressure. On change to the preferred SI unit pascal, many meteorologists prefer to keep using the magnitude they are used to and thus do not use the preferred prefix kilo, but hecto.
In the former Soviet mts system the unit of pressure is the pieze, which is equivalent to one kilopascal.
Standard atmospheric pressure is 101,325 Pa = 101.325 kPa = 1013.25 hPa = 1013.25 mbar.
The same unit is used to measure stress, Young's modulus and tensile strength.
(See SI prefix for guide to units.)
| 0.5 Pa | Atmospheric pressure on PlutoPluto is the ninth planet from the Sun in our solar system. Because Pluto is also the smallest planet in our solar system and has a highly eccentric orbit (which takes it inside the orbit of Neptune) there has been some debate regarding whether Pluto shou (1988 figure; very roughly) |
| 9.81 Pa | The pressure caused by a depth of 1 mm of waterDrinking water This article focuses on water as we experience it every day. The water (molecule) article describes water from a scientific and technical perspective. Water is an abundant substance on Earth. It exists in many forms, such as sea, rain, and¹ |
| 1 kPa | Atmospheric pressure on MarsMars is the fourth planet from the Sun in the solar system, named after the Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. Mars has two small moons, Phobos and Deimos, both small and odd |
| 10 kPa | The pressure caused by a depth of 1 m of water, or the drop in air pressure when going from sea levelFor considerations of sea level change, in particular rise associated with possible global warming, see sea level rise''. Mean sea level (MSL) is the average height of the sea, with reference to a suitable reference surface. Defining the reference level , to 1000 m elevation¹ |
| 101,325 Pa | Atmospheric pressure at sea level¹ |
| 10 MPa | Pressure washer forces out water at this pressure |
| 100 MPa | Pressure at bottom of Mariana TrenchThe Mariana Trench is the deepest known submarine trench. It is located in the floor of the western North Pacific Ocean, to the east of the Mariana Islands. The trench has a maximum depth of 10,924 m (35,840 ft). It was fully surveyed in 1951 by the Briti, about 10 km under ocean¹ |
| 10 GPa | DiamondAlternate meanings: Diamond (disambiguation Diamond is one of the natural allotropes of carbon (the main allotrope being graphite; see also allotropes of carbon). The hardest of naturally occurring materials, diamonds cut into multi-faceted shapes are amo forms |
| 100 GPa | Theoretical tensile strength of carbon nanotubeCarbon nanotubes are cylindrical carbon molecules with properties that make them potentially useful in extremely small scale electronic and mechanical applications. They exhibit unusual strength and unique electrical properties, and are efficient conductos (CNTs) |
¹at the Earth's surface