TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Cooling towers. Thermogram of water vapour rising out of cooling towers at a power station. A thermogram shows the 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 pink (coldest, 8.3 degrees celsius) through blue, green, yellow and red and to white (warmest, 24 degrees celsius).
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