TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Cooling towers. Thermogram of water vapour rising out of cooling towers by a road. The object at lower centre left is a lorry. 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 dark blue (coldest, 9.1 degrees celsius) through green, yellow, orange, red and pink to white (warmest, 24 degrees celsius).
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