DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY
Finger. Thermogram of a close-up of a human finger, showing the variation in surface temperature. The temperature scale runs from red (warmest) through yellow to green (coldest). Thermography is a technique for visualising the temperature of surfaces by recording their emission of long-wavelength infrared radiation. This heat radiation is detected and displayed with different colours representing different temperatures.
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