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| Velocity distribution for a fluid flow around a source. | Stream lines for a fluid flow around a source. The flow streams outward from the source in the picture. Notice that places where the density of stream lines is small correspond to low average speed of the fluid molecules and vice versa. |
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| Velocity distribution for a fluid flow around a vortex. | Stream lines for a fluid flow around a vortex. The flow streams in clockwise circles around the vortex in the picture. Notice that places where the density of stream lines is small correspond to low average speed of the fluid molecules and vice versa. |