Pressure is defined as the force per unit area applied on a surface in a
direction perpendicular to that surface.
To calculate the pressure formula is :
Pressure = Force / Area.
Pressure unit in SI system is pascal (pa). It is equivalent to one newton per
square meter. Other pressure units, kilopascal (kpa), megapascal (mpa), psi
(pound per square inch), torr (mmHg), atm (atmospheric pressure), bar and pound
per square foot are widely used.