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 before the game. Spots of red (the middle of the temperature range) appear on his face & arms. These are the warmest parts of his body. The rest of his body is even cooler, appearing blue, green & purple.
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