Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pressure-sensitive paint (PSP) is a method for measuring air pressure, usually in aerodynamic settings. It is paint which fluoresces in differing intensities depending on the external air pressure being applied to its surface. Due to the high cost of constructing airplanes, the first designs of proposed aircraft are usually subjected to aerodynamic testing in wind tunnels. In these tunnels, models (usually subscale) are subjected to airflows to simulate an actual airplane in free flight. The aerodynamic forces acting on the model are measured, and are used to predict the response of an airplane when subjected to equivalent airflows. Automobiles are also subjected to aerodynamic testing in wind tunnels. Automobile companies use data collected in these tests to measure areas of high and low pressure. This data helps engineers improve designs to increase performance for the vehicles. By changing these designs, engineers can help improve gas mileage and reduce noise.

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