Pressure
The amount of force acting on a specific amount of surface area, typically measured in pounds per square inch or psi.
Also defined in 2 more sources
Force per unit area. Hydraulic and pneumatic pressure are normally given in units of pounds per square inch (psi).
Aviation Maintenance Technician Handbook — Airframe, p. G-27
A measure of force applied uniformly over a given unit of surface area.
Aviation Maintenance Technician Handbook — Powerplant, p. G-21
Used throughout the curriculum.