The Pascal is defined exactly as
1 N/m² (Newton per square meter)
The Pascal (Pa) is the pressure unit of the International System, named after the French mathematician and physicist Blaise Pascal. It is defined as the pressure exerted by a force of one Newton distributed uniformly over an area of one square meter. Being a very small unit relative to everyday pressures (atmospheric pressure is about 100,000 Pa), its multiples are often used in practice, such as the kilopascal (kPa) or the megapascal (MPa).
The formal definition of the Pascal links force and area:
In terms of other common pressure units, the Pascal equals:
The Pascal is the reference unit in physics, engineering, and meteorology (where its multiple, the hectopascal hPa, is used for atmospheric pressure), and is essential in any scientific calculation requiring consistency with other International System units, such as the Newton, the meter, and the kilogram.