Question

Explain why to keep a piece of paper horizontal you should blow over, not under it

Answer 1

Heya!!

Answer to your question:

It is so because when you blow air over the paper pressure will increase. so pressure is high above paper and there is low pressure below paper. So as we know any substance will go from low pressure to high pressure. Same will the paper do and become horizontal .

Hope it helps *_*

Answer 2

Hii dear,

# Explaination-
- It is in accordance with Bernoulli's principle.
- When we blow above paper, velocity of air above becomes more than velocity below it.
- Increase in KE(above) causes decrease in pressure above paper.
- As atmosphere pressure is acting below, the paper remains horizontal and doesn't fall.
- When be blow under, large pressure above folds the paper downwards.


Hope that was useful...