Human coughing, schlieren image

Human coughing, schlieren image

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Credit: DR GARY SETTLES/SCIENCE PHOTO LIBRARY

Caption: Human coughing, schlieren image. Schlieren photography is an imaging technique that is used to show changes in the density of fluids and gases such as air, caused here by the turbulence produced by the coughing action. The jet of air expelled by coughing projects infectious pathogens deep into the surrounding air. The colored background is a prismatic effect due to dispersion through a lens in the optical imaging system. Photographed at Pennsylvania State University, USA.

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