And often, there are windows that let those same scientists observe experiments visually. Typically, there are sensors and instruments inside wind tunnels that give scientists hard data regarding an object's interaction with wind. Although the test materials (usually) remain stationary, rapid airflow inside the tunnel makes it seem as though objects are moving. Other tunnels are massive structures in which engineers test full-size aircraft and cars. Some tunnels are desktop-sized and good for testing only very small objects. Wind tunnels are simply hollow tubes at one end, they have powerful fans that create a flow of air inside the tunnel. Wind tunnels, on the other hand, provide a controlled environment for this kind of testing. From swaying, unstable breezes to hurricane-force blasts, Mother Earth's wind is a notoriously fickle condition, and thus, pretty much worthless for aerodynamics testing.
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