Question

When the speed of air is low what does it moves?

Answer 1

Explanation:

It's all about conservation of momentum, F=ma. Fluid can only change velocity by experiencing a force, and the only force it can feel is a pressure difference. So if there's a velocity difference, there's a pressure difference, and vice-versa (neglecting other things, like gravity).

Answer 2

Answer:

Moving air has lower pressure

Explanation:

As air speeds up, its pressure goes down. So the faster-moving air above exerts less pressure on the wing than the slower-moving air below.

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