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| Steady flow of a fluid, gas or liquid. At each point the average speed of the molecules is equal to a mean value given by v(x,y) and which is constant in time. | Stream lines for a steady flow. |
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| Velocity distribution for a fluid flow against a wall. | Stream lines for a fluid flow against a wall. Notice that places where the density of stream lines is small correspond to low average speed of the fluid molecules. |