How does a fan blade cause air to move?

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Science & Mathematics by Anonymous 2018-08-05 06:45:04

Social Science

How does a fan blade cause air to move?

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I understand that there must be a pressure gradient causing the air to move. What I don t understand is how this gradient is created. If the blade of the fan is moving in the x-y plane how does it create a gradient in the z-direction?