Definition
The flow velocity u of a fluid is a vector field
which gives the velocity of an element of fluid at a position and time .
The flow speed q is the length of the flow velocity vector
and is a scalar field.
Read more about this topic: Flow Velocity
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“No man, not even a doctor, ever gives any other definition of what a nurse should be than thisdevoted and obedient. This definition would do just as well for a porter. It might even do for a horse. It would not do for a policeman.”
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