DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY
Tongue. Thermogram of a close-up view of a woman's face in profile, with her tongue stuck out. Also seen are the woman's teeth and lower jaw. Thermography is a technique for visualising the temperature of surfaces (such as skin) by recording their emission of long-wavelength infrared radiation. This heat radiation is detected electronically and displayed with different colours representing different temperatures. In this image, the temperature scale runs from white (warmest) through red, yellow to green (coldest).
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