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| Stream lines for a fluid flow around an elliptical cylinder (air wing). Notice that places where the density of stream lines is small correspond to low average speed of the fluid molecules. | Flow around the Wing of an airplane (KLM, TAP Portugal, Japan Airlines, Lufthansa, Alitalia, United Airlines, Delta Airlines, Emirates airlines, Qantas, British Airways). |
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| Stream lines for a fluid flow around a spinning tennis ball. Notice that places where the density of stream lines is small correspond to low average speed of the fluid molecules. | Stream lines for a fluid flow from a source (hair dryer) around a ping-pong ball. Notice that places where the density of stream lines is small correspond to low average speed of the fluid molecules. |