DR GARY SETTLES / SCIENCE PHOTO LIBRARY DR GARY SETTLES / SCIENCE PHOTO LIBRARY
Human thermal plume of a young girl, 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 warmth of the human body. The skin convects heat to the surrounding air, which then rises due to buoyancy, creating the human thermal plume. Photographed at Pennsylvania State University, USA.
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