T-SERVICE / SCIENCE PHOTO LIBRARY T-SERVICE / SCIENCE PHOTO LIBRARY
People in snow. Thermogram of a group of people standing on snow-covered ground. A thermogram shows variation in temperature on the surface of an object, measured by the long-wave infrared radiation it emits. The temperature scale is colour-coded and runs from black (coldest, -3.3 degrees Celsius) through blue, purple red and orange to yellow (warmest, 25.9 degrees Celsius).
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