TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Power station. Thermogram of emissions from cooling towers and a chimney at a power station. The object at lower right is a car. 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 black (coldest, 8 degrees celsius) through blue, green, yellow, orange, red and pink to white (warmest, 24 degrees celsius).
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