Air flow.

You know which way the air flows,

Divide that by ten percent of the air flow,

It's shut off from the world, but air flows freely.

Air can flow in, but not out.

I'm not allowed to keep the air flowing in the conference room...

(b) Natural ventilation, with the reduced number of solid walls increasing air flow;

If you accidentally injected a bubble, we'll see good air flow but poor blood flow.

Now if you accidentally injected a bubble, we'll see good air flow but poor blood flow.

The spin was induced by the disruption of air flow into the starboard engine.