# Flow velocity

## Vector field which is used to mathematically describe the motion of a continuum / From Wikipedia, the free encyclopedia

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In continuum mechanics the **flow velocity** in fluid dynamics, also **macroscopic velocity**^{[1]}^{[2]} in statistical mechanics, or **drift velocity** in electromagnetism, is a vector field used to mathematically describe the motion of a continuum. The length of the flow velocity vector is scalar, the * flow speed*.
It is also called

**velocity field**; when evaluated along a line, it is called a

**velocity profile**(as in, e.g., law of the wall).