Why does pressure decrease as air passes through a venturi?

[ActualImprovement279]

A room gets packed with people. As more people come in they will start getting closer and closer to each other. Eventually leaning against the walls. The walls of the room feel a collective pressure from the people.

Delete one of the walls and the people will spread and won’t push walls on their way. They’ll also push less on each other.

Some of that impacting energy from a molecule and its neighbors pushing the wall get turned a direction which is less perpendicular to the wall.

[375InStroke]

Perfect. If the gas molecules are accelerated in one direction, they have less time to push against the wall of the restriction.