Hair dryer, Schlieren photograph

Hair dryer, Schlieren photograph

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Caption: Hair dryer. Schlieren photograph showing the air turbulence caused by using a hair dryer. Schlieren photographs are used to visualise heat and airflow around objects. Changes in the density of air, caused here by turbulence, cause light to refract (bend), and show up in the image as differences in colour and brightness. Photographed using the 1 metre diameter parabolic mirror (round) at the Gas Dynamics Laboratory, Pennsylvania State University, USA.

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