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When you blow on the top of a piece of paper, the air you blow creates a region of low pressure above the paper. This low-pressure area draws the paper upwards, causing it to rise. Additionally, the fast-moving air you blow creates momentum that lifts the paper.

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Related Questions

Why does a peice of paper rise as you blow over it?

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.


Why does a piece of paper bend as you blow under?

When you blow under a piece of paper, the air flow creates a low-pressure area under the paper, causing it to bend towards the side with higher pressure (usually the top side). The pressure difference between the top and bottom of the paper results in a lifting force that causes the paper to bend.


Why a sheet of paper rises when you blow air above the tissue paper?

When you blow air above a sheet of paper, you create a region of low pressure due to the fast-moving air. This lower pressure above the paper creates a pressure difference between the top and bottom of the paper, causing the paper to be pushed upwards by the higher air pressure below it. This lift force causes the paper to rise.


Why does the paper get blown off when you blow under it?

When you blow air under a piece of paper, the air pressure beneath the paper decreases, creating a difference in pressure between the top and bottom surfaces. The higher atmospheric pressure on top pushes down on the paper, while the lower pressure underneath causes the paper to lift and be blown away. This phenomenon is a demonstration of Bernoulli's principle, where faster-moving air results in lower pressure.


Why does a piece of paper rise as you blow air across it?

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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