Differential pressure
The difference between two pressures. An airspeed indicator is a differential-pressure gauge. It measures the difference between static air pressure and pitot air pressure.
Aviation Maintenance Technician Handbook — Airframe, p. G-12
Also defined in 2 more sources
A single pressure that is the difference between two opposing pressures.
Aviation Maintenance Technician Handbook — Powerplant, p. G-9
A difference between two pressures. The measurement of airspeed is an example of the use of differential pressure.
Taught in GEN-J Quick reference.