DR GARY SETTLES / SCIENCE PHOTO LIBRARY DR GARY SETTLES / SCIENCE PHOTO LIBRARY
Human sneezing, 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 of the air following sneezing. Turbulent air appears near the beginning of a human sneeze. The air exits through the nasal passages, but also from the mouth as well. Photographed at Pennsylvania State University, USA.
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