[1]: § 3.5 In compressible flows, stagnation pressure is also equal to total pressure as well, provided that the fluid entering the stagnation point is brought to rest isentropically.
The magnitude of stagnation pressure can be derived from Bernoulli equation[3][1]: § 3.5 for incompressible flow and no height changes.
); and 2) at a "stagnation" point where the fluid is at rest with respect to the measuring apparatus (for example at the end of a pitot tube in an airplane).
which is called the "dynamic" or "ram" pressure because it results from fluid motion.
can't be used for the dynamic pressure.
[5] Stagnation pressure is the static pressure a gas retains when brought to rest isentropically from Mach number M.[6] or, assuming an isentropic process, the stagnation pressure can be calculated from the ratio of stagnation temperature to static temperature: where: The above derivation holds only for the case when the gas is assumed to be calorically perfect (specific heats and the ratio of the specific heats