ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Feet. Thermogram of a man's feet showing the variation in skin surface temperature. The temperature scale runs from white (warmest) through yellow to purple (coldest). In thermography, surface temperatures are visualized by recording their emission of long-wavelength infrared (heat) radiation. This technique may be used as a health check.
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