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When you blow - you're moving the air that was static over the top of the paper. This lowers the air pressure relative to the air underneath, so it pushes upwards on the piece of paper.

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Q: Why does a peice of paper rise as you blow over it?
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Answer To put it simply, by blowing across the piece of paper you are creating low pressure. This is the same way that an airplane wing works. Except on an air craft air is forced underneath the wing to create lox pressure underneath it creating an upwards force called lift which pushes the air craft up. The piece of paper is so light that the low pressure that you are creating over the top of it makes the paper rise toward it. The same thing happens with your shower curtain in the shower sometimes. Did you ever wonder why the shower curtain closes in on you while in the shower? Well now you know. EDIT! - The above answer is the common explanation but it is incorrect. The paper lifts because the airflow sticks to the paper and is directed downward - forcing the paper upward. For the above explanation to be true you should be able to hold a piece of paper horizontally and make it lift by blowing across it - but it doesn't.


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