Fluid Mechanics
Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.

∂/∂t = constant
∂/∂s = 0
∂/∂t = 0
∂/∂t = constant

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Fluid Mechanics
A stream line is

Fixed in space in steady flow
Drawn normal to the velocity vector at every point
Always the path of particle
A line connecting the mid points of flow cross-section

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