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Is a device used to study air flow through a solid object, the air will be blown or pump through tubes leading wind with the object under test and observation for measurement devices or installed. Most popular measure shake of the building. Test object will have a device with a sensitive balance to measure the force that created the air flow was mostly used; or air flow, there may be other substances or smoke is injected so that the flow path can be seen around the aircraft objects or large vehicles, but the real test is a large wind tunnel sometime, but these facilities are expensive to operate and that some of these functions have been taken over by computer modeling.
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