ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY. ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY.
Thermogram, or heat image, of a man immediately before playing a game of squash. The colour code runs from white, at the hottest extreme, through yellow, red, blue, green, purple to black, the coldest colour. The player is cool. His face & arms, the warmest parts of his body, are coded red, which lies in the middle of the temperature range recorded here. The rest of his body is cooler, appearing blue, green & purple.
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