Grade upto college level General Physics
To keep a piece of paper horizontal,you should blow over ,not under it explain why?
1 Answer
Apoorva Arora
When air is blown under a paper, the velocity of air is greater under the paper than it is above it. As per Bernoulli’s principle, atmospheric pressure reduces under the paper. This makes the paper fall. To keep a piece of paper horizontal, one should blow over it. This increases the velocity of air above the paper. As per Bernoulli’s principle, atmospheric pressure reduces above the paper and the paper remains horizontal.
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Apoorva Arora
IIT Roorkee
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