| http://www.w3.org/ns/prov#value | - The differential equations of the streamlines may be written dr X v = 0, where dr is an element of the streamline and v is the velocity vector; or in Cartesian coordinates, dx / u = dy /v = dz /w, where u, v, w, are the fluid velocities along the orthogonal X, Y, Z axes, respectively.
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