Static pressure ($p$)

The local fluid pressure, distinguished from dynamic pressure and stagnation pressure. "Static" does not require the fluid to be stationary.

Pressure referred to an ideal vacuum, rather than to atmospheric pressure or another chosen reference. Gauge pressure instead subtracts atmospheric pressure.

The pressure obtained by bringing a flow to rest without losses; in compressible flow the usual definition specifies an isentropic process for stopping. For the constant-mass density, same-height Bernoulli equation discussed under dynamic pressure, $p_0=p+q$.

An upstream-facing probe that senses stagnation pressure. Determining speed also requires a separate static pressure and mass density.

A combined Pitot tube and static pressure probe with separate passages for the two pressures.