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.)

¹at the Earth's surface

Comparison to other units of pressure