Definition
The pressure exerted by a moving fluid (such as air) due to its motion. It is equal to one-half the fluid density multiplied by the square of its velocity (½ρV²). In aviation, dynamic pressure is the pressure component produced by the aircraft's motion through the air, and it is what the pitot tube measures (along with static pressure) to derive airspeed.
Plain English
It's the pressure you feel from air rushing at you because something is moving through it. The faster the movement, the bigger the pressure — and it grows quickly, because doubling the speed makes this pressure four times greater.
Context Anchor
Seen in airspeed indicator operation, pitot-static system maintenance, and discussions of lift, drag, and control effectiveness.
Derivation
From Greek 'dynamis' meaning 'power' or 'force from motion.' The name fits — dynamic pressure is the pressure that exists because of motion, as opposed to static pressure, which exists regardless of motion.
Why Pilots Care
Dynamic pressure determines how much lift and drag the wings generate and is the basis for calculating indicated airspeed.
Analogy
Holding your hand out of a moving car window gives a simple feel for dynamic pressure. At low speed the air pushes lightly; at higher speed the air pushes much harder.
Grounding Statement
Stick your hand out a car window at 30 mph, then at 60 mph — the push you feel isn't doubled, it's roughly four times stronger. That extra push is dynamic pressure at work.
Intuition Check
Dynamic pressure does not mean pressure that is changing randomly. Here, dynamic means pressure caused by motion through the air.
Example Sentence 1
As airspeed increases, dynamic pressure rises sharply, which is why control surfaces feel firmer at higher speeds.
Example Sentence 2
The airspeed indicator works by comparing total pressure to static pressure to display the effects of dynamic pressure.