T-SERVICE / SCIENCE PHOTO LIBRARY T-SERVICE / SCIENCE PHOTO LIBRARY
Windmill. Thermogram of a windmill and surrounding buildings. 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, -61 degrees Celsius) through blue, green, yellow and red to white (warmest, 34.9 degrees Celsius).
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