Plain English Meaning
When air or any fluid speeds up, its pressure drops. When it slows down, its pressure rises.
Full Definition
A principle of fluid dynamics stating that as the speed of a moving fluid (liquid or gas) increases, the pressure within that fluid decreases. In aviation, this relationship between velocity and pressure helps explain how airflow over a wing produces lift and how venturi-style devices generate suction for pneumatic instruments.
Context Anchor
Seen in pneumatic system discussions, especially when explaining how airflow or a venturi-type passage can create the pressure difference used by .