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SERVICES - Wind Tunnel Construction

Models

For aircraft or buildings, scale models usually have to be built. One problem, however, is that the air behaves differently with small models to how it behaves with objects in their actual size. By increasing the air pressure and/or reducing the temperature, however, the air properties can be made to fit the scale of the model. In some wind channels, therefore, cold nitrogen is used at -160°C instead of air.