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According to Bernoulli's Principle, the pressure of a fluid decreases with increase in velocity. However I am not able to understand. Can you talk me the logic behind it and describe what is happening molecular level.

Asked by sureshkalanjoor 29th July 2016, 11:11 AM
Answered by Expert
Answer:
The pressure in a fluid is due to the molecules hitting the boundary of the tube.
 
When the fluid has less velocity, the molecules have more time to collide with the boundaries. More time means more force is being exerted. So, the pressure is also more as pressure is Force/area.
 
Thus, a fluid with high velocity will have decreased pressure.
 
This can also be seen from the Benoulli's principle
 
begin mathsize 12px style straight P plus 1 half ρv squared plus ρgh equals constant
Hence comma space if space straight v space increases comma space straight P space has space to space decrease space in space order space to space keep space the space sum space constant. end style
Answered by Expert 29th July 2016, 4:45 PM
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