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Consider the shaded portions of the fluids at P and Q. Then, in a given time
interval, 
where 
Bernoulli's Equation The equation of continuity as explained above is a consequence of conservation of mass; whereas Bernoulli's equation is consequence of the work - energy theorem or conservation of energy. 
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8.1 Hydrostatic pressure in a fluid Follow @Pinkmonkey_com  |
= mass of fluid at P crossing 
mass of fluid at
Q crossing A2 must be equal, because the same fluid particles keep on moving
in a given tube of flow.
are volumes of fluids in shaded parts at P and Q of respectively
and
are density of fluid at P and Q.