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, the eminent French mathematician, physicist and philosopher.

1 Pa

= 1 N/m² = 1 (kg·m/s²)/m² = 1 kg/m·s²

= 0.01 millibar

= 0.00001 bar

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.

1 hectopascal (hPa) 

= 100 Pa = 1 mbar

1 kilopascal (kPa) 

= 1000 Pa = 10 hPa

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.

In Unicode, Pascal is represented by ㎩, and a kilopascal is represented by ㎪.

Examples of various values (approximately)

(See SI prefix for guide to units.)

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
101,325 Pa	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)

¹at the Earth's surface

Comparison to other units of pressure

1 bar	100,000 Pa
1 millibar	100 Pa
1 atmosphere	101,325 Pa
1 mmHg (or torr)	133.332 Pa
1 inch Hg	3,386.833 Pa

ca:Pascal (unitat) cs:Pascal de:Pascal (Einheit) es:Pascal (unidad de presión) eo:Paskalo fr:Pascal (unité) it:Pascal (misura) nl:Pascal ja:パスカル no:Pascal (enhet) pl:Paskal sl:Pascal fi:Pascal (yksikkö) sv:Pascal (måttenhet)