Fluid Mechanics
A stream line is

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

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Fluid Mechanics
Steady flow occurs, when the

Rate of the velocity change is constant
Conditions do not change with time at any point
Conditions are the same at the adjacent points at any instant
Conditions change steadily with time

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