Question

Explain why:
To keep a piece of paper horizontal, you should blow over, not under it.
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Answer 1

Answer:

to maintain the pressure below and above it so that it can be horizontal

hope it will help u

Answer 2

Answer:

When air is blown under a paper the velocity of air is greater under the paper than above it.As per Bernoulli's principle atmospheric reduces under the paper.This makes the paper fall.To keep a piece of paper horizontal we should blow over not under it.