Question

The pressure which is a result of the random motion of the gas molecules is ______

(a) Total Pressure

(b) Stagnation Pressure

(c) Dynamic Pressure

(d) Static Pressure

This question was addressed to me in an internship interview.

I'd like to ask this question from Definition of Total Stagnation Conditions in section Compressible Flow – Preliminary Aspects of Aerodynamics

Answer 1

Correct answer is (d) Static Pressure

Easy explanation: Gases are the most randomly moving molecules. The pressure due to this random motion of gas molecules is the static pressure. It is as if we are riding along with the gas at the local flow velocity.