A thermogram of a hand giving the OK sign

A thermogram of a hand giving the OK sign

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Credit: EDWARD KINSMAN/SCIENCE PHOTO LIBRARY

Caption: A thermogram of a hand giving the OK sign. The temperature range goes from hot (white) to cold (blue). Thermography is a technique for visualizing the temperature of surfaces by recording the emission of long-wavelength infrared radiation. This heat radiation is detected electronically and displayed with different colours representing different temperatures.

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Keywords: body, cold, finger, fingers, forefinger, forefingers, hand signal, hand signals, hands, heat, heat loss, hot, human, human hand, human hands, infrared, ok, ok sign, ok signs, okay, palm, palms, radiation, sign, sign language, signal, signals, signs, symbol, symbols, temperature, temperatures, thermogram, thermograms, thermograph, thermography, thumb, thumbs, yes, yes sign, yes signs

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