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## B

Streamline flow is the smooth flow of a fluid without any eddies due to turbulence. It is destroyed when a fluid flows along a pipe or a canal too fast.

Notice that all the quantities in the equation are evaluated at a point; p is thrust per unit area at a point, p is mass per unit volume at a point, v is the rate of change of displacement at a point, g is the gravitational field strength at a point and h is the vertical distance of the point from a reference level.